Added vendor directory to source control

vendor/react/promise

@@ -1 +0,0 @@
-Subproject commit f3cff96a19736714524ca0dd1d4130de73dbbbc4

vendor/react/promise/.travis.yml

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+language: php
+
+php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - 7.2
+  - 7.3
+  - 7.4
+  - nightly # ignore errors, see below
+  - hhvm # ignore errors, see below
+
+# lock distro so new future defaults will not break the build
+dist: trusty
+
+matrix:
+  allow_failures:
+    - php: hhvm
+    - php: nightly
+
+install:
+  - composer install
+
+script:
+  - ./vendor/bin/phpunit -v --coverage-text --coverage-clover=./build/logs/clover.xml
+
+after_script:
+  - if [ -f ./build/logs/clover.xml ]; then travis_retry composer require satooshi/php-coveralls --no-interaction --update-with-dependencies; fi
+  - if [ -f ./build/logs/clover.xml ]; then php vendor/bin/coveralls -v; fi

vendor/react/promise/CHANGELOG.md

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+CHANGELOG for 2.x
+=================
+
+* 2.8.0 (2020-05-12)
+
+    *   Mark `FulfilledPromise`, `RejectedPromise` and `LazyPromise` as deprecated for Promise v2 (and remove for Promise v3).
+        (#143 and #165 by @clue)
+
+        ```php
+        // deprecated
+        $fulfilled = new React\Promise\FulfilledPromise($value);
+        $rejected = new React\Promise\RejectedPromise($reason);
+
+        // recommended alternatives
+        $fulfilled = React\Promise\resolve($value);
+        $rejected = React\Promise\reject($reason);
+        ```
+
+    *   Fix: Fix checking whether cancellable promise is an object and avoid possible warning.
+        (#168 by @smscr and @jsor)
+
+    *   Improve documentation and add docblocks to functions and interfaces.
+        (#135 by @CharlotteDunois)
+
+    *   Add `.gitattributes` to exclude dev files from exports.
+        (#154 by @reedy)
+
+    *   Improve test suite, run tests on PHP 7.4 and update PHPUnit test setup.
+        (#163 by @clue)
+
+* 2.7.1 (2018-01-07)
+
+    *   Fix: file_exists warning when resolving with long strings.
+        (#130 by @sbesselsen)
+    *   Improve performance by prefixing all global functions calls with \ to skip the look up and resolve process and go straight to the global function.
+        (#133 by @WyriHaximus)
+
+* 2.7.0 (2018-06-13)
+
+    *   Feature: Improve memory consumption for pending promises by using static internal callbacks without binding to self.
+        (#124 by @clue)
+
+* 2.6.0 (2018-06-11)
+
+    *   Feature: Significantly improve memory consumption and performance by only passing resolver args
+        to resolver and canceller if callback requires them. Also use static callbacks without
+        binding to promise, clean up canceller function reference when they are no longer
+        needed and hide resolver and canceller references from call stack on PHP 7+.
+        (#113, #115, #116, #117, #118, #119 and #123 by @clue)
+
+        These changes combined mean that rejecting promises with an `Exception` should
+        no longer cause any internal circular references which could cause some unexpected
+        memory growth in previous versions. By explicitly avoiding and explicitly
+        cleaning up said references, we can avoid relying on PHP's circular garbage collector
+        to kick in which significantly improves performance when rejecting many promises.
+
+    *   Mark legacy progress support / notification API as deprecated
+        (#112 by @clue)
+
+    *   Recommend rejecting promises by throwing an exception
+        (#114 by @jsor)
+
+    *   Improve documentation to properly instantiate LazyPromise
+        (#121 by @holtkamp)
+
+    *   Follower cancellation propagation was originally planned for this release
+        but has been reverted for now and is planned for a future release.
+        (#99 by @jsor and #122 by @clue)
+
+* 2.5.1 (2017-03-25)
+
+    * Fix circular references when resolving with a promise which follows
+      itself (#94).
+
+* 2.5.0 (2016-12-22)
+
+    * Revert automatic cancellation of pending collection promises once the
+      output promise resolves. This was introduced in 42d86b7 (PR #36, released
+      in [v2.3.0](https://github.com/reactphp/promise/releases/tag/v2.3.0)) and
+      was both unintended and backward incompatible.
+
+      If you need automatic cancellation, you can use something like:
+
+      ```php
+      function allAndCancel(array $promises)
+      {
+           return \React\Promise\all($promises)
+               ->always(function() use ($promises) {
+                   foreach ($promises as $promise) {
+                       if ($promise instanceof \React\Promise\CancellablePromiseInterface) {
+                           $promise->cancel();
+                       }
+                   }
+              });
+      }
+      ```
+    * `all()` and `map()` functions now preserve the order of the array (#77).
+    * Fix circular references when resolving a promise with itself (#71).
+
+* 2.4.1 (2016-05-03)
+
+    * Fix `some()` not cancelling pending promises when too much input promises
+      reject (16ff799).
+
+* 2.4.0 (2016-03-31)
+
+    * Support foreign thenables in `resolve()`.
+      Any object that provides a `then()` method is now assimilated to a trusted
+      promise that follows the state of this thenable (#52).
+    * Fix `some()` and `any()` for input arrays containing not enough items
+      (#34).
+
+* 2.3.0 (2016-03-24)
+
+    * Allow cancellation of promises returned by functions working on promise
+      collections (#36).
+    * Handle `\Throwable` in the same way as `\Exception` (#51 by @joshdifabio).
+
+* 2.2.2 (2016-02-26)
+
+    * Fix cancellation handlers called multiple times (#47 by @clue).
+
+* 2.2.1 (2015-07-03)
+
+    * Fix stack error when resolving a promise in its own fulfillment or
+      rejection handlers.
+
+* 2.2.0 (2014-12-30)
+
+    * Introduce new `ExtendedPromiseInterface` implemented by all promises.
+    * Add new `done()` method (part of the `ExtendedPromiseInterface`).
+    * Add new `otherwise()` method (part of the `ExtendedPromiseInterface`).
+    * Add new `always()` method (part of the `ExtendedPromiseInterface`).
+    * Add new `progress()` method (part of the `ExtendedPromiseInterface`).
+    * Rename `Deferred::progress` to `Deferred::notify` to avoid confusion with
+      `ExtendedPromiseInterface::progress` (a `Deferred::progress` alias is
+      still available for backward compatibility)
+    * `resolve()` now always returns a `ExtendedPromiseInterface`.
+
+* 2.1.0 (2014-10-15)
+
+    * Introduce new `CancellablePromiseInterface` implemented by all promises.
+    * Add new `cancel()` method (part of the `CancellablePromiseInterface`).
+
+* 2.0.0 (2013-12-10)
+
+    New major release. The goal is to streamline the API and to make it more
+    compliant with other promise libraries and especially with the new upcoming
+    [ES6 promises specification](https://github.com/domenic/promises-unwrapping/).
+
+    * Add standalone Promise class.
+    * Add new `race()` function.
+    * BC break: Bump minimum PHP version to PHP 5.4.
+    * BC break: Remove `ResolverInterface` and `PromiseInterface` from 
+      `Deferred`.
+    * BC break: Change signature of `PromiseInterface`.
+    * BC break: Remove `When` and `Util` classes and move static methods to
+      functions.
+    * BC break: `FulfilledPromise` and `RejectedPromise` now throw an exception
+      when initialized with a promise instead of a value/reason.
+    * BC break: `Deferred::resolve()` and `Deferred::reject()` no longer return
+      a promise.

vendor/react/promise/LICENSE

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+Copyright (c) 2012-2016 Jan Sorgalla
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

vendor/react/promise/README.md

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+Promise
+=======
+
+A lightweight implementation of
+[CommonJS Promises/A](http://wiki.commonjs.org/wiki/Promises/A) for PHP.
+
+[![Build Status](https://travis-ci.org/reactphp/promise.svg?branch=master)](http://travis-ci.org/reactphp/promise)
+[![Coverage Status](https://coveralls.io/repos/github/reactphp/promise/badge.svg?branch=master)](https://coveralls.io/github/reactphp/promise?branch=master)
+
+Table of Contents
+-----------------
+
+1. [Introduction](#introduction)
+2. [Concepts](#concepts)
+   * [Deferred](#deferred)
+   * [Promise](#promise-1)
+3. [API](#api)
+   * [Deferred](#deferred-1)
+     * [Deferred::promise()](#deferredpromise)
+     * [Deferred::resolve()](#deferredresolve)
+     * [Deferred::reject()](#deferredreject)
+     * [Deferred::notify()](#deferrednotify)
+   * [PromiseInterface](#promiseinterface)
+     * [PromiseInterface::then()](#promiseinterfacethen)
+   * [ExtendedPromiseInterface](#extendedpromiseinterface)
+        * [ExtendedPromiseInterface::done()](#extendedpromiseinterfacedone)
+        * [ExtendedPromiseInterface::otherwise()](#extendedpromiseinterfaceotherwise)
+        * [ExtendedPromiseInterface::always()](#extendedpromiseinterfacealways)
+        * [ExtendedPromiseInterface::progress()](#extendedpromiseinterfaceprogress)
+   * [CancellablePromiseInterface](#cancellablepromiseinterface)
+        * [CancellablePromiseInterface::cancel()](#cancellablepromiseinterfacecancel)
+   * [Promise](#promise-2)
+   * [FulfilledPromise](#fulfilledpromise)
+   * [RejectedPromise](#rejectedpromise)
+   * [LazyPromise](#lazypromise)
+   * [Functions](#functions)
+     * [resolve()](#resolve)
+     * [reject()](#reject)
+     * [all()](#all)
+     * [race()](#race)
+     * [any()](#any)
+     * [some()](#some)
+     * [map()](#map)
+     * [reduce()](#reduce)
+   * [PromisorInterface](#promisorinterface)
+4. [Examples](#examples)
+   * [How to use Deferred](#how-to-use-deferred)
+   * [How promise forwarding works](#how-promise-forwarding-works)
+     * [Resolution forwarding](#resolution-forwarding)
+     * [Rejection forwarding](#rejection-forwarding)
+     * [Mixed resolution and rejection forwarding](#mixed-resolution-and-rejection-forwarding)
+     * [Progress event forwarding](#progress-event-forwarding)
+   * [done() vs. then()](#done-vs-then)
+5. [Install](#install)
+6. [Credits](#credits)
+7. [License](#license)
+
+Introduction
+------------
+
+Promise is a library implementing
+[CommonJS Promises/A](http://wiki.commonjs.org/wiki/Promises/A) for PHP.
+
+It also provides several other useful promise-related concepts, such as joining
+multiple promises and mapping and reducing collections of promises.
+
+If you've never heard about promises before,
+[read this first](https://gist.github.com/3889970).
+
+Concepts
+--------
+
+### Deferred
+
+A **Deferred** represents a computation or unit of work that may not have
+completed yet. Typically (but not always), that computation will be something
+that executes asynchronously and completes at some point in the future.
+
+### Promise
+
+While a deferred represents the computation itself, a **Promise** represents
+the result of that computation. Thus, each deferred has a promise that acts as
+a placeholder for its actual result.
+
+API
+---
+
+### Deferred
+
+A deferred represents an operation whose resolution is pending. It has separate
+promise and resolver parts.
+
+```php
+$deferred = new React\Promise\Deferred();
+
+$promise = $deferred->promise();
+
+$deferred->resolve(mixed $value = null);
+$deferred->reject(mixed $reason = null);
+$deferred->notify(mixed $update = null);
+```
+
+The `promise` method returns the promise of the deferred.
+
+The `resolve` and `reject` methods control the state of the deferred.
+
+The deprecated `notify` method is for progress notification.
+
+The constructor of the `Deferred` accepts an optional `$canceller` argument.
+See [Promise](#promise-2) for more information.
+
+#### Deferred::promise()
+
+```php
+$promise = $deferred->promise();
+```
+
+Returns the promise of the deferred, which you can hand out to others while
+keeping the authority to modify its state to yourself.
+
+#### Deferred::resolve()
+
+```php
+$deferred->resolve(mixed $value = null);
+```
+
+Resolves the promise returned by `promise()`. All consumers are notified by
+having `$onFulfilled` (which they registered via `$promise->then()`) called with
+`$value`.
+
+If `$value` itself is a promise, the promise will transition to the state of
+this promise once it is resolved.
+
+#### Deferred::reject()
+
+```php
+$deferred->reject(mixed $reason = null);
+```
+
+Rejects the promise returned by `promise()`, signalling that the deferred's
+computation failed.
+All consumers are notified by having `$onRejected` (which they registered via
+`$promise->then()`) called with `$reason`.
+
+If `$reason` itself is a promise, the promise will be rejected with the outcome
+of this promise regardless whether it fulfills or rejects.
+
+#### Deferred::notify()
+
+> Deprecated in v2.6.0: Progress support is deprecated and should not be used anymore.
+
+```php
+$deferred->notify(mixed $update = null);
+```
+
+Triggers progress notifications, to indicate to consumers that the computation
+is making progress toward its result.
+
+All consumers are notified by having `$onProgress` (which they registered via
+`$promise->then()`) called with `$update`.
+
+### PromiseInterface
+
+The promise interface provides the common interface for all promise
+implementations.
+
+A promise represents an eventual outcome, which is either fulfillment (success)
+and an associated value, or rejection (failure) and an associated reason.
+
+Once in the fulfilled or rejected state, a promise becomes immutable.
+Neither its state nor its result (or error) can be modified.
+
+#### Implementations
+
+* [Promise](#promise-2)
+* [FulfilledPromise](#fulfilledpromise) (deprecated)
+* [RejectedPromise](#rejectedpromise) (deprecated)
+* [LazyPromise](#lazypromise) (deprecated)
+
+#### PromiseInterface::then()
+
+```php
+$transformedPromise = $promise->then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null);
+```
+
+Transforms a promise's value by applying a function to the promise's fulfillment
+or rejection value. Returns a new promise for the transformed result.
+
+The `then()` method registers new fulfilled, rejection and progress handlers
+with a promise (all parameters are optional):
+
+  * `$onFulfilled` will be invoked once the promise is fulfilled and passed
+    the result as the first argument.
+  * `$onRejected` will be invoked once the promise is rejected and passed the
+    reason as the first argument.
+  * `$onProgress` (deprecated) will be invoked whenever the producer of the promise
+    triggers progress notifications and passed a single argument (whatever it
+    wants) to indicate progress.
+
+It returns a new promise that will fulfill with the return value of either
+`$onFulfilled` or `$onRejected`, whichever is called, or will reject with
+the thrown exception if either throws.
+
+A promise makes the following guarantees about handlers registered in
+the same call to `then()`:
+
+  1. Only one of `$onFulfilled` or `$onRejected` will be called,
+     never both.
+  2. `$onFulfilled` and `$onRejected` will never be called more
+     than once.
+  3. `$onProgress` (deprecated) may be called multiple times.
+
+#### See also
+
+* [resolve()](#resolve) - Creating a resolved promise
+* [reject()](#reject) - Creating a rejected promise
+* [ExtendedPromiseInterface::done()](#extendedpromiseinterfacedone)
+* [done() vs. then()](#done-vs-then)
+
+### ExtendedPromiseInterface
+
+The ExtendedPromiseInterface extends the PromiseInterface with useful shortcut
+and utility methods which are not part of the Promises/A specification.
+
+#### Implementations
+
+* [Promise](#promise-1)
+* [FulfilledPromise](#fulfilledpromise) (deprecated)
+* [RejectedPromise](#rejectedpromise) (deprecated)
+* [LazyPromise](#lazypromise) (deprecated)
+
+#### ExtendedPromiseInterface::done()
+
+```php
+$promise->done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null);
+```
+
+Consumes the promise's ultimate value if the promise fulfills, or handles the
+ultimate error.
+
+It will cause a fatal error if either `$onFulfilled` or `$onRejected` throw or
+return a rejected promise.
+
+Since the purpose of `done()` is consumption rather than transformation,
+`done()` always returns `null`.
+
+#### See also
+
+* [PromiseInterface::then()](#promiseinterfacethen)
+* [done() vs. then()](#done-vs-then)
+
+#### ExtendedPromiseInterface::otherwise()
+
+```php
+$promise->otherwise(callable $onRejected);
+```
+
+Registers a rejection handler for promise. It is a shortcut for:
+
+```php
+$promise->then(null, $onRejected);
+```
+
+Additionally, you can type hint the `$reason` argument of `$onRejected` to catch
+only specific errors.
+
+```php
+$promise
+    ->otherwise(function (\RuntimeException $reason) {
+        // Only catch \RuntimeException instances
+        // All other types of errors will propagate automatically
+    })
+    ->otherwise(function ($reason) {
+        // Catch other errors
+    )};
+```
+
+#### ExtendedPromiseInterface::always()
+
+```php
+$newPromise = $promise->always(callable $onFulfilledOrRejected);
+```
+
+Allows you to execute "cleanup" type tasks in a promise chain.
+
+It arranges for `$onFulfilledOrRejected` to be called, with no arguments,
+when the promise is either fulfilled or rejected.
+
+* If `$promise` fulfills, and `$onFulfilledOrRejected` returns successfully,
+  `$newPromise` will fulfill with the same value as `$promise`.
+* If `$promise` fulfills, and `$onFulfilledOrRejected` throws or returns a
+  rejected promise, `$newPromise` will reject with the thrown exception or
+  rejected promise's reason.
+* If `$promise` rejects, and `$onFulfilledOrRejected` returns successfully,
+  `$newPromise` will reject with the same reason as `$promise`.
+* If `$promise` rejects, and `$onFulfilledOrRejected` throws or returns a
+  rejected promise, `$newPromise` will reject with the thrown exception or
+  rejected promise's reason.
+
+`always()` behaves similarly to the synchronous finally statement. When combined
+with `otherwise()`, `always()` allows you to write code that is similar to the familiar
+synchronous catch/finally pair.
+
+Consider the following synchronous code:
+
+```php
+try {
+  return doSomething();
+} catch(\Exception $e) {
+    return handleError($e);
+} finally {
+    cleanup();
+}
+```
+
+Similar asynchronous code (with `doSomething()` that returns a promise) can be
+written:
+
+```php
+return doSomething()
+    ->otherwise('handleError')
+    ->always('cleanup');
+```
+
+#### ExtendedPromiseInterface::progress()
+
+> Deprecated in v2.6.0: Progress support is deprecated and should not be used anymore.
+
+```php
+$promise->progress(callable $onProgress);
+```
+
+Registers a handler for progress updates from promise. It is a shortcut for:
+
+```php
+$promise->then(null, null, $onProgress);
+```
+
+### CancellablePromiseInterface
+
+A cancellable promise provides a mechanism for consumers to notify the creator
+of the promise that they are not longer interested in the result of an
+operation.
+
+#### CancellablePromiseInterface::cancel()
+
+``` php
+$promise->cancel();
+```
+
+The `cancel()` method notifies the creator of the promise that there is no
+further interest in the results of the operation.
+
+Once a promise is settled (either fulfilled or rejected), calling `cancel()` on
+a promise has no effect.
+
+#### Implementations
+
+* [Promise](#promise-1)
+* [FulfilledPromise](#fulfilledpromise) (deprecated)
+* [RejectedPromise](#rejectedpromise) (deprecated)
+* [LazyPromise](#lazypromise) (deprecated)
+
+### Promise
+
+Creates a promise whose state is controlled by the functions passed to
+`$resolver`.
+
+```php
+$resolver = function (callable $resolve, callable $reject, callable $notify) {
+    // Do some work, possibly asynchronously, and then
+    // resolve or reject. You can notify of progress events (deprecated)
+    // along the way if you want/need.
+
+    $resolve($awesomeResult);
+    // or throw new Exception('Promise rejected');
+    // or $resolve($anotherPromise);
+    // or $reject($nastyError);
+    // or $notify($progressNotification);
+};
+
+$canceller = function () {
+    // Cancel/abort any running operations like network connections, streams etc.
+
+    // Reject promise by throwing an exception
+    throw new Exception('Promise cancelled');
+};
+
+$promise = new React\Promise\Promise($resolver, $canceller);
+```
+
+The promise constructor receives a resolver function and an optional canceller
+function which both will be called with 3 arguments:
+
+  * `$resolve($value)` - Primary function that seals the fate of the
+    returned promise. Accepts either a non-promise value, or another promise.
+    When called with a non-promise value, fulfills promise with that value.
+    When called with another promise, e.g. `$resolve($otherPromise)`, promise's
+    fate will be equivalent to that of `$otherPromise`.
+  * `$reject($reason)` - Function that rejects the promise. It is recommended to
+    just throw an exception instead of using `$reject()`.
+  * `$notify($update)` - Deprecated function that issues progress events for the promise.
+
+If the resolver or canceller throw an exception, the promise will be rejected
+with that thrown exception as the rejection reason.
+
+The resolver function will be called immediately, the canceller function only
+once all consumers called the `cancel()` method of the promise.
+
+### FulfilledPromise
+
+> Deprecated in v2.8.0: External usage of `FulfilledPromise` is deprecated, use `resolve()` instead.
+
+Creates a already fulfilled promise.
+
+```php
+$promise = React\Promise\FulfilledPromise($value);
+```
+
+Note, that `$value` **cannot** be a promise. It's recommended to use
+[resolve()](#resolve) for creating resolved promises.
+
+### RejectedPromise
+
+> Deprecated in v2.8.0: External usage of `RejectedPromise` is deprecated, use `reject()` instead.
+
+Creates a already rejected promise.
+
+```php
+$promise = React\Promise\RejectedPromise($reason);
+```
+
+Note, that `$reason` **cannot** be a promise. It's recommended to use
+[reject()](#reject) for creating rejected promises.
+
+### LazyPromise
+
+> Deprecated in v2.8.0: LazyPromise is deprecated and should not be used anymore.
+
+Creates a promise which will be lazily initialized by `$factory` once a consumer
+calls the `then()` method.
+
+```php
+$factory = function () {
+    $deferred = new React\Promise\Deferred();
+
+    // Do some heavy stuff here and resolve the deferred once completed
+
+    return $deferred->promise();
+};
+
+$promise = new React\Promise\LazyPromise($factory);
+
+// $factory will only be executed once we call then()
+$promise->then(function ($value) {
+});
+```
+
+### Functions
+
+Useful functions for creating, joining, mapping and reducing collections of
+promises.
+
+All functions working on promise collections (like `all()`, `race()`, `some()`
+etc.) support cancellation. This means, if you call `cancel()` on the returned
+promise, all promises in the collection are cancelled. If the collection itself
+is a promise which resolves to an array, this promise is also cancelled.
+
+#### resolve()
+
+```php
+$promise = React\Promise\resolve(mixed $promiseOrValue);
+```
+
+Creates a promise for the supplied `$promiseOrValue`.
+
+If `$promiseOrValue` is a value, it will be the resolution value of the
+returned promise.
+
+If `$promiseOrValue` is a thenable (any object that provides a `then()` method),
+a trusted promise that follows the state of the thenable is returned.
+
+If `$promiseOrValue` is a promise, it will be returned as is.
+
+Note: The promise returned is always a promise implementing
+[ExtendedPromiseInterface](#extendedpromiseinterface). If you pass in a custom
+promise which only implements [PromiseInterface](#promiseinterface), this
+promise will be assimilated to a extended promise following `$promiseOrValue`.
+
+#### reject()
+
+```php
+$promise = React\Promise\reject(mixed $promiseOrValue);
+```
+
+Creates a rejected promise for the supplied `$promiseOrValue`.
+
+If `$promiseOrValue` is a value, it will be the rejection value of the
+returned promise.
+
+If `$promiseOrValue` is a promise, its completion value will be the rejected
+value of the returned promise.
+
+This can be useful in situations where you need to reject a promise without
+throwing an exception. For example, it allows you to propagate a rejection with
+the value of another promise.
+
+#### all()
+
+```php
+$promise = React\Promise\all(array|React\Promise\PromiseInterface $promisesOrValues);
+```
+
+Returns a promise that will resolve only once all the items in
+`$promisesOrValues` have resolved. The resolution value of the returned promise
+will be an array containing the resolution values of each of the items in
+`$promisesOrValues`.
+
+#### race()
+
+```php
+$promise = React\Promise\race(array|React\Promise\PromiseInterface $promisesOrValues);
+```
+
+Initiates a competitive race that allows one winner. Returns a promise which is
+resolved in the same way the first settled promise resolves.
+
+#### any()
+
+```php
+$promise = React\Promise\any(array|React\Promise\PromiseInterface $promisesOrValues);
+```
+
+Returns a promise that will resolve when any one of the items in
+`$promisesOrValues` resolves. The resolution value of the returned promise
+will be the resolution value of the triggering item.
+
+The returned promise will only reject if *all* items in `$promisesOrValues` are
+rejected. The rejection value will be an array of all rejection reasons.
+
+The returned promise will also reject with a `React\Promise\Exception\LengthException`
+if `$promisesOrValues` contains 0 items.
+
+#### some()
+
+```php
+$promise = React\Promise\some(array|React\Promise\PromiseInterface $promisesOrValues, integer $howMany);
+```
+
+Returns a promise that will resolve when `$howMany` of the supplied items in
+`$promisesOrValues` resolve. The resolution value of the returned promise
+will be an array of length `$howMany` containing the resolution values of the
+triggering items.
+
+The returned promise will reject if it becomes impossible for `$howMany` items
+to resolve (that is, when `(count($promisesOrValues) - $howMany) + 1` items
+reject). The rejection value will be an array of
+`(count($promisesOrValues) - $howMany) + 1` rejection reasons.
+
+The returned promise will also reject with a `React\Promise\Exception\LengthException`
+if `$promisesOrValues` contains less items than `$howMany`.
+
+#### map()
+
+```php
+$promise = React\Promise\map(array|React\Promise\PromiseInterface $promisesOrValues, callable $mapFunc);
+```
+
+Traditional map function, similar to `array_map()`, but allows input to contain
+promises and/or values, and `$mapFunc` may return either a value or a promise.
+
+The map function receives each item as argument, where item is a fully resolved
+value of a promise or value in `$promisesOrValues`.
+
+#### reduce()
+
+```php
+$promise = React\Promise\reduce(array|React\Promise\PromiseInterface $promisesOrValues, callable $reduceFunc , $initialValue = null);
+```
+
+Traditional reduce function, similar to `array_reduce()`, but input may contain
+promises and/or values, and `$reduceFunc` may return either a value or a
+promise, *and* `$initialValue` may be a promise or a value for the starting
+value.
+
+### PromisorInterface
+
+The `React\Promise\PromisorInterface` provides a common interface for objects
+that provide a promise. `React\Promise\Deferred` implements it, but since it
+is part of the public API anyone can implement it.
+
+Examples
+--------
+
+### How to use Deferred
+
+```php
+function getAwesomeResultPromise()
+{
+    $deferred = new React\Promise\Deferred();
+
+    // Execute a Node.js-style function using the callback pattern
+    computeAwesomeResultAsynchronously(function ($error, $result) use ($deferred) {
+        if ($error) {
+            $deferred->reject($error);
+        } else {
+            $deferred->resolve($result);
+        }
+    });
+
+    // Return the promise
+    return $deferred->promise();
+}
+
+getAwesomeResultPromise()
+    ->then(
+        function ($value) {
+            // Deferred resolved, do something with $value
+        },
+        function ($reason) {
+            // Deferred rejected, do something with $reason
+        },
+        function ($update) {
+            // Progress notification triggered, do something with $update
+        }
+    );
+```
+
+### How promise forwarding works
+
+A few simple examples to show how the mechanics of Promises/A forwarding works.
+These examples are contrived, of course, and in real usage, promise chains will
+typically be spread across several function calls, or even several levels of
+your application architecture.
+
+#### Resolution forwarding
+
+Resolved promises forward resolution values to the next promise.
+The first promise, `$deferred->promise()`, will resolve with the value passed
+to `$deferred->resolve()` below.
+
+Each call to `then()` returns a new promise that will resolve with the return
+value of the previous handler. This creates a promise "pipeline".
+
+```php
+$deferred = new React\Promise\Deferred();
+
+$deferred->promise()
+    ->then(function ($x) {
+        // $x will be the value passed to $deferred->resolve() below
+        // and returns a *new promise* for $x + 1
+        return $x + 1;
+    })
+    ->then(function ($x) {
+        // $x === 2
+        // This handler receives the return value of the
+        // previous handler.
+        return $x + 1;
+    })
+    ->then(function ($x) {
+        // $x === 3
+        // This handler receives the return value of the
+        // previous handler.
+        return $x + 1;
+    })
+    ->then(function ($x) {
+        // $x === 4
+        // This handler receives the return value of the
+        // previous handler.
+        echo 'Resolve ' . $x;
+    });
+
+$deferred->resolve(1); // Prints "Resolve 4"
+```
+
+#### Rejection forwarding
+
+Rejected promises behave similarly, and also work similarly to try/catch:
+When you catch an exception, you must rethrow for it to propagate.
+
+Similarly, when you handle a rejected promise, to propagate the rejection,
+"rethrow" it by either returning a rejected promise, or actually throwing
+(since promise translates thrown exceptions into rejections)
+
+```php
+$deferred = new React\Promise\Deferred();
+
+$deferred->promise()
+    ->then(function ($x) {
+        throw new \Exception($x + 1);
+    })
+    ->otherwise(function (\Exception $x) {
+        // Propagate the rejection
+        throw $x;
+    })
+    ->otherwise(function (\Exception $x) {
+        // Can also propagate by returning another rejection
+        return React\Promise\reject(
+            new \Exception($x->getMessage() + 1)
+        );
+    })
+    ->otherwise(function ($x) {
+        echo 'Reject ' . $x->getMessage(); // 3
+    });
+
+$deferred->resolve(1);  // Prints "Reject 3"
+```
+
+#### Mixed resolution and rejection forwarding
+
+Just like try/catch, you can choose to propagate or not. Mixing resolutions and
+rejections will still forward handler results in a predictable way.
+
+```php
+$deferred = new React\Promise\Deferred();
+
+$deferred->promise()
+    ->then(function ($x) {
+        return $x + 1;
+    })
+    ->then(function ($x) {
+        throw new \Exception($x + 1);
+    })
+    ->otherwise(function (\Exception $x) {
+        // Handle the rejection, and don't propagate.
+        // This is like catch without a rethrow
+        return $x->getMessage() + 1;
+    })
+    ->then(function ($x) {
+        echo 'Mixed ' . $x; // 4
+    });
+
+$deferred->resolve(1);  // Prints "Mixed 4"
+```
+
+#### Progress event forwarding
+
+> Deprecated in v2.6.0: Progress support is deprecated and should not be used anymore.
+
+In the same way as resolution and rejection handlers, your progress handler
+**MUST** return a progress event to be propagated to the next link in the chain.
+If you return nothing, `null` will be propagated.
+
+Also in the same way as resolutions and rejections, if you don't register a
+progress handler, the update will be propagated through.
+
+If your progress handler throws an exception, the exception will be propagated
+to the next link in the chain. The best thing to do is to ensure your progress
+handlers do not throw exceptions.
+
+This gives you the opportunity to transform progress events at each step in the
+chain so that they are meaningful to the next step. It also allows you to choose
+not to transform them, and simply let them propagate untransformed, by not
+registering a progress handler.
+
+```php
+$deferred = new React\Promise\Deferred();
+
+$deferred->promise()
+    ->progress(function ($update) {
+        return $update + 1;
+    })
+    ->progress(function ($update) {
+        echo 'Progress ' . $update; // 2
+    });
+
+$deferred->notify(1);  // Prints "Progress 2"
+```
+
+### done() vs. then()
+
+The golden rule is:
+
+    Either return your promise, or call done() on it.
+
+At a first glance, `then()` and `done()` seem very similar. However, there are
+important distinctions.
+
+The intent of `then()` is to transform a promise's value and to pass or return
+a new promise for the transformed value along to other parts of your code.
+
+The intent of `done()` is to consume a promise's value, transferring
+responsibility for the value to your code.
+
+In addition to transforming a value, `then()` allows you to recover from, or
+propagate intermediate errors. Any errors that are not handled will be caught
+by the promise machinery and used to reject the promise returned by `then()`.
+
+Calling `done()` transfers all responsibility for errors to your code. If an
+error (either a thrown exception or returned rejection) escapes the
+`$onFulfilled` or `$onRejected` callbacks you provide to done, it will be
+rethrown in an uncatchable way causing a fatal error.
+
+```php
+function getJsonResult()
+{
+    return queryApi()
+        ->then(
+            // Transform API results to an object
+            function ($jsonResultString) {
+                return json_decode($jsonResultString);
+            },
+            // Transform API errors to an exception
+            function ($jsonErrorString) {
+                $object = json_decode($jsonErrorString);
+                throw new ApiErrorException($object->errorMessage);
+            }
+        );
+}
+
+// Here we provide no rejection handler. If the promise returned has been
+// rejected, the ApiErrorException will be thrown
+getJsonResult()
+    ->done(
+        // Consume transformed object
+        function ($jsonResultObject) {
+            // Do something with $jsonResultObject
+        }
+    );
+
+// Here we provide a rejection handler which will either throw while debugging
+// or log the exception
+getJsonResult()
+    ->done(
+        function ($jsonResultObject) {
+            // Do something with $jsonResultObject
+        },
+        function (ApiErrorException $exception) {
+            if (isDebug()) {
+                throw $exception;
+            } else {
+                logException($exception);
+            }
+        }
+    );
+```
+
+Note that if a rejection value is not an instance of `\Exception`, it will be
+wrapped in an exception of the type `React\Promise\UnhandledRejectionException`.
+
+You can get the original rejection reason by calling `$exception->getReason()`.
+
+Install
+-------
+
+The recommended way to install this library is [through Composer](https://getcomposer.org).
+[New to Composer?](https://getcomposer.org/doc/00-intro.md)
+
+This project follows [SemVer](https://semver.org/).
+This will install the latest supported version:
+
+```bash
+$ composer require react/promise:^2.8
+```
+
+See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
+
+This project aims to run on any platform and thus does not require any PHP
+extensions and supports running on legacy PHP 5.4 through current PHP 7+ and HHVM.
+It's *highly recommended to use PHP 7+* for this project due to its vast
+performance improvements.
+
+Credits
+-------
+
+Promise is a port of [when.js](https://github.com/cujojs/when)
+by [Brian Cavalier](https://github.com/briancavalier).
+
+Also, large parts of the documentation have been ported from the when.js
+[Wiki](https://github.com/cujojs/when/wiki) and the
+[API docs](https://github.com/cujojs/when/blob/master/docs/api.md).
+
+License
+-------
+
+Released under the [MIT](LICENSE) license.

vendor/react/promise/composer.json

@@ -0,0 +1,29 @@
+{
+    "name": "react/promise",
+    "description": "A lightweight implementation of CommonJS Promises/A for PHP",
+    "license": "MIT",
+    "authors": [
+        {"name": "Jan Sorgalla", "email": "jsorgalla@gmail.com"}
+    ],
+    "require": {
+        "php": ">=5.4.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^7.0 || ^6.5 || ^5.7 || ^4.8.36"
+    },
+    "autoload": {
+        "psr-4": {
+            "React\\Promise\\": "src/"
+        },
+        "files": ["src/functions_include.php"]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "React\\Promise\\": ["tests", "tests/fixtures"]
+        }
+    },
+    "keywords": [
+        "promise",
+        "promises"
+    ]
+}

vendor/react/promise/phpunit.xml.dist

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         bootstrap="vendor/autoload.php"
+>
+    <testsuites>
+        <testsuite name="Promise Test Suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+            <exclude>
+                <file>./src/functions_include.php</file>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>

vendor/react/promise/src/CancellablePromiseInterface.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace React\Promise;
+
+interface CancellablePromiseInterface extends PromiseInterface
+{
+    /**
+     * The `cancel()` method notifies the creator of the promise that there is no
+     * further interest in the results of the operation.
+     *
+     * Once a promise is settled (either fulfilled or rejected), calling `cancel()` on
+     * a promise has no effect.
+     *
+     * @return void
+     */
+    public function cancel();
+}

vendor/react/promise/src/CancellationQueue.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace React\Promise;
+
+class CancellationQueue
+{
+    private $started = false;
+    private $queue = [];
+
+    public function __invoke()
+    {
+        if ($this->started) {
+            return;
+        }
+
+        $this->started = true;
+        $this->drain();
+    }
+
+    public function enqueue($cancellable)
+    {
+        if (!\is_object($cancellable) || !\method_exists($cancellable, 'then') || !\method_exists($cancellable, 'cancel')) {
+            return;
+        }
+
+        $length = \array_push($this->queue, $cancellable);
+
+        if ($this->started && 1 === $length) {
+            $this->drain();
+        }
+    }
+
+    private function drain()
+    {
+        for ($i = key($this->queue); isset($this->queue[$i]); $i++) {
+            $cancellable = $this->queue[$i];
+
+            $exception = null;
+
+            try {
+                $cancellable->cancel();
+            } catch (\Throwable $exception) {
+            } catch (\Exception $exception) {
+            }
+
+            unset($this->queue[$i]);
+
+            if ($exception) {
+                throw $exception;
+            }
+        }
+
+        $this->queue = [];
+    }
+}

vendor/react/promise/src/Deferred.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace React\Promise;
+
+class Deferred implements PromisorInterface
+{
+    private $promise;
+    private $resolveCallback;
+    private $rejectCallback;
+    private $notifyCallback;
+    private $canceller;
+
+    public function __construct(callable $canceller = null)
+    {
+        $this->canceller = $canceller;
+    }
+
+    public function promise()
+    {
+        if (null === $this->promise) {
+            $this->promise = new Promise(function ($resolve, $reject, $notify) {
+                $this->resolveCallback = $resolve;
+                $this->rejectCallback  = $reject;
+                $this->notifyCallback  = $notify;
+            }, $this->canceller);
+            $this->canceller = null;
+        }
+
+        return $this->promise;
+    }
+
+    public function resolve($value = null)
+    {
+        $this->promise();
+
+        \call_user_func($this->resolveCallback, $value);
+    }
+
+    public function reject($reason = null)
+    {
+        $this->promise();
+
+        \call_user_func($this->rejectCallback, $reason);
+    }
+
+    /**
+     * @deprecated 2.6.0 Progress support is deprecated and should not be used anymore.
+     * @param mixed $update
+     */
+    public function notify($update = null)
+    {
+        $this->promise();
+
+        \call_user_func($this->notifyCallback, $update);
+    }
+
+    /**
+     * @deprecated 2.2.0
+     * @see Deferred::notify()
+     */
+    public function progress($update = null)
+    {
+        $this->notify($update);
+    }
+}

vendor/react/promise/src/Exception/LengthException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace React\Promise\Exception;
+
+class LengthException extends \LengthException
+{
+}

vendor/react/promise/src/ExtendedPromiseInterface.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace React\Promise;
+
+interface ExtendedPromiseInterface extends PromiseInterface
+{
+    /**
+     * Consumes the promise's ultimate value if the promise fulfills, or handles the
+     * ultimate error.
+     *
+     * It will cause a fatal error if either `$onFulfilled` or
+     * `$onRejected` throw or return a rejected promise.
+     *
+     * Since the purpose of `done()` is consumption rather than transformation,
+     * `done()` always returns `null`.
+     *
+     * @param callable|null $onFulfilled
+     * @param callable|null $onRejected
+     * @param callable|null $onProgress This argument is deprecated and should not be used anymore.
+     * @return void
+     */
+    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null);
+
+    /**
+     * Registers a rejection handler for promise. It is a shortcut for:
+     *
+     * ```php
+     * $promise->then(null, $onRejected);
+     * ```
+     *
+     * Additionally, you can type hint the `$reason` argument of `$onRejected` to catch
+     * only specific errors.
+     *
+     * @param callable $onRejected
+     * @return ExtendedPromiseInterface
+     */
+    public function otherwise(callable $onRejected);
+
+    /**
+     * Allows you to execute "cleanup" type tasks in a promise chain.
+     *
+     * It arranges for `$onFulfilledOrRejected` to be called, with no arguments,
+     * when the promise is either fulfilled or rejected.
+     *
+     * * If `$promise` fulfills, and `$onFulfilledOrRejected` returns successfully,
+     *    `$newPromise` will fulfill with the same value as `$promise`.
+     * * If `$promise` fulfills, and `$onFulfilledOrRejected` throws or returns a
+     *    rejected promise, `$newPromise` will reject with the thrown exception or
+     *    rejected promise's reason.
+     * * If `$promise` rejects, and `$onFulfilledOrRejected` returns successfully,
+     *    `$newPromise` will reject with the same reason as `$promise`.
+     * * If `$promise` rejects, and `$onFulfilledOrRejected` throws or returns a
+     *    rejected promise, `$newPromise` will reject with the thrown exception or
+     *    rejected promise's reason.
+     *
+     * `always()` behaves similarly to the synchronous finally statement. When combined
+     * with `otherwise()`, `always()` allows you to write code that is similar to the familiar
+     * synchronous catch/finally pair.
+     *
+     * Consider the following synchronous code:
+     *
+     * ```php
+     * try {
+     *     return doSomething();
+     * } catch(\Exception $e) {
+     *     return handleError($e);
+     * } finally {
+     *     cleanup();
+     * }
+     * ```
+     *
+     * Similar asynchronous code (with `doSomething()` that returns a promise) can be
+     * written:
+     *
+     * ```php
+     * return doSomething()
+     *     ->otherwise('handleError')
+     *     ->always('cleanup');
+     * ```
+     *
+     * @param callable $onFulfilledOrRejected
+     * @return ExtendedPromiseInterface
+     */
+    public function always(callable $onFulfilledOrRejected);
+
+    /**
+     * Registers a handler for progress updates from promise. It is a shortcut for:
+     *
+     * ```php
+     * $promise->then(null, null, $onProgress);
+     * ```
+     *
+     * @param callable $onProgress
+     * @return ExtendedPromiseInterface
+     * @deprecated 2.6.0 Progress support is deprecated and should not be used anymore.
+     */
+    public function progress(callable $onProgress);
+}

vendor/react/promise/src/FulfilledPromise.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace React\Promise;
+
+/**
+ * @deprecated 2.8.0 External usage of FulfilledPromise is deprecated, use `resolve()` instead.
+ */
+class FulfilledPromise implements ExtendedPromiseInterface, CancellablePromiseInterface
+{
+    private $value;
+
+    public function __construct($value = null)
+    {
+        if ($value instanceof PromiseInterface) {
+            throw new \InvalidArgumentException('You cannot create React\Promise\FulfilledPromise with a promise. Use React\Promise\resolve($promiseOrValue) instead.');
+        }
+
+        $this->value = $value;
+    }
+
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        if (null === $onFulfilled) {
+            return $this;
+        }
+
+        try {
+            return resolve($onFulfilled($this->value));
+        } catch (\Throwable $exception) {
+            return new RejectedPromise($exception);
+        } catch (\Exception $exception) {
+            return new RejectedPromise($exception);
+        }
+    }
+
+    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        if (null === $onFulfilled) {
+            return;
+        }
+
+        $result = $onFulfilled($this->value);
+
+        if ($result instanceof ExtendedPromiseInterface) {
+            $result->done();
+        }
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this;
+    }
+
+    public function always(callable $onFulfilledOrRejected)
+    {
+        return $this->then(function ($value) use ($onFulfilledOrRejected) {
+            return resolve($onFulfilledOrRejected())->then(function () use ($value) {
+                return $value;
+            });
+        });
+    }
+
+    public function progress(callable $onProgress)
+    {
+        return $this;
+    }
+
+    public function cancel()
+    {
+    }
+}

vendor/react/promise/src/LazyPromise.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace React\Promise;
+
+/**
+ * @deprecated 2.8.0 LazyPromise is deprecated and should not be used anymore.
+ */
+class LazyPromise implements ExtendedPromiseInterface, CancellablePromiseInterface
+{
+    private $factory;
+    private $promise;
+
+    public function __construct(callable $factory)
+    {
+        $this->factory = $factory;
+    }
+
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        return $this->promise()->then($onFulfilled, $onRejected, $onProgress);
+    }
+
+    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        return $this->promise()->done($onFulfilled, $onRejected, $onProgress);
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this->promise()->otherwise($onRejected);
+    }
+
+    public function always(callable $onFulfilledOrRejected)
+    {
+        return $this->promise()->always($onFulfilledOrRejected);
+    }
+
+    public function progress(callable $onProgress)
+    {
+        return $this->promise()->progress($onProgress);
+    }
+
+    public function cancel()
+    {
+        return $this->promise()->cancel();
+    }
+
+    /**
+     * @internal
+     * @see Promise::settle()
+     */
+    public function promise()
+    {
+        if (null === $this->promise) {
+            try {
+                $this->promise = resolve(\call_user_func($this->factory));
+            } catch (\Throwable $exception) {
+                $this->promise = new RejectedPromise($exception);
+            } catch (\Exception $exception) {
+                $this->promise = new RejectedPromise($exception);
+            }
+        }
+
+        return $this->promise;
+    }
+}

vendor/react/promise/src/Promise.php

@@ -0,0 +1,256 @@
+<?php
+
+namespace React\Promise;
+
+class Promise implements ExtendedPromiseInterface, CancellablePromiseInterface
+{
+    private $canceller;
+    private $result;
+
+    private $handlers = [];
+    private $progressHandlers = [];
+
+    private $requiredCancelRequests = 0;
+    private $cancelRequests = 0;
+
+    public function __construct(callable $resolver, callable $canceller = null)
+    {
+        $this->canceller = $canceller;
+
+        // Explicitly overwrite arguments with null values before invoking
+        // resolver function. This ensure that these arguments do not show up
+        // in the stack trace in PHP 7+ only.
+        $cb = $resolver;
+        $resolver = $canceller = null;
+        $this->call($cb);
+    }
+
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        if (null !== $this->result) {
+            return $this->result->then($onFulfilled, $onRejected, $onProgress);
+        }
+
+        if (null === $this->canceller) {
+            return new static($this->resolver($onFulfilled, $onRejected, $onProgress));
+        }
+
+        // This promise has a canceller, so we create a new child promise which
+        // has a canceller that invokes the parent canceller if all other
+        // followers are also cancelled. We keep a reference to this promise
+        // instance for the static canceller function and clear this to avoid
+        // keeping a cyclic reference between parent and follower.
+        $parent = $this;
+        ++$parent->requiredCancelRequests;
+
+        return new static(
+            $this->resolver($onFulfilled, $onRejected, $onProgress),
+            static function () use (&$parent) {
+                if (++$parent->cancelRequests >= $parent->requiredCancelRequests) {
+                    $parent->cancel();
+                }
+
+                $parent = null;
+            }
+        );
+    }
+
+    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        if (null !== $this->result) {
+            return $this->result->done($onFulfilled, $onRejected, $onProgress);
+        }
+
+        $this->handlers[] = static function (ExtendedPromiseInterface $promise) use ($onFulfilled, $onRejected) {
+            $promise
+                ->done($onFulfilled, $onRejected);
+        };
+
+        if ($onProgress) {
+            $this->progressHandlers[] = $onProgress;
+        }
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, static function ($reason) use ($onRejected) {
+            if (!_checkTypehint($onRejected, $reason)) {
+                return new RejectedPromise($reason);
+            }
+
+            return $onRejected($reason);
+        });
+    }
+
+    public function always(callable $onFulfilledOrRejected)
+    {
+        return $this->then(static function ($value) use ($onFulfilledOrRejected) {
+            return resolve($onFulfilledOrRejected())->then(function () use ($value) {
+                return $value;
+            });
+        }, static function ($reason) use ($onFulfilledOrRejected) {
+            return resolve($onFulfilledOrRejected())->then(function () use ($reason) {
+                return new RejectedPromise($reason);
+            });
+        });
+    }
+
+    public function progress(callable $onProgress)
+    {
+        return $this->then(null, null, $onProgress);
+    }
+
+    public function cancel()
+    {
+        if (null === $this->canceller || null !== $this->result) {
+            return;
+        }
+
+        $canceller = $this->canceller;
+        $this->canceller = null;
+
+        $this->call($canceller);
+    }
+
+    private function resolver(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        return function ($resolve, $reject, $notify) use ($onFulfilled, $onRejected, $onProgress) {
+            if ($onProgress) {
+                $progressHandler = static function ($update) use ($notify, $onProgress) {
+                    try {
+                        $notify($onProgress($update));
+                    } catch (\Throwable $e) {
+                        $notify($e);
+                    } catch (\Exception $e) {
+                        $notify($e);
+                    }
+                };
+            } else {
+                $progressHandler = $notify;
+            }
+
+            $this->handlers[] = static function (ExtendedPromiseInterface $promise) use ($onFulfilled, $onRejected, $resolve, $reject, $progressHandler) {
+                $promise
+                    ->then($onFulfilled, $onRejected)
+                    ->done($resolve, $reject, $progressHandler);
+            };
+
+            $this->progressHandlers[] = $progressHandler;
+        };
+    }
+
+    private function reject($reason = null)
+    {
+        if (null !== $this->result) {
+            return;
+        }
+
+        $this->settle(reject($reason));
+    }
+
+    private function settle(ExtendedPromiseInterface $promise)
+    {
+        $promise = $this->unwrap($promise);
+
+        if ($promise === $this) {
+            $promise = new RejectedPromise(
+                new \LogicException('Cannot resolve a promise with itself.')
+            );
+        }
+
+        $handlers = $this->handlers;
+
+        $this->progressHandlers = $this->handlers = [];
+        $this->result = $promise;
+        $this->canceller = null;
+
+        foreach ($handlers as $handler) {
+            $handler($promise);
+        }
+    }
+
+    private function unwrap($promise)
+    {
+        $promise = $this->extract($promise);
+
+        while ($promise instanceof self && null !== $promise->result) {
+            $promise = $this->extract($promise->result);
+        }
+
+        return $promise;
+    }
+
+    private function extract($promise)
+    {
+        if ($promise instanceof LazyPromise) {
+            $promise = $promise->promise();
+        }
+
+        return $promise;
+    }
+
+    private function call(callable $cb)
+    {
+        // Explicitly overwrite argument with null value. This ensure that this
+        // argument does not show up in the stack trace in PHP 7+ only.
+        $callback = $cb;
+        $cb = null;
+
+        // Use reflection to inspect number of arguments expected by this callback.
+        // We did some careful benchmarking here: Using reflection to avoid unneeded
+        // function arguments is actually faster than blindly passing them.
+        // Also, this helps avoiding unnecessary function arguments in the call stack
+        // if the callback creates an Exception (creating garbage cycles).
+        if (\is_array($callback)) {
+            $ref = new \ReflectionMethod($callback[0], $callback[1]);
+        } elseif (\is_object($callback) && !$callback instanceof \Closure) {
+            $ref = new \ReflectionMethod($callback, '__invoke');
+        } else {
+            $ref = new \ReflectionFunction($callback);
+        }
+        $args = $ref->getNumberOfParameters();
+
+        try {
+            if ($args === 0) {
+                $callback();
+            } else {
+                // Keep references to this promise instance for the static resolve/reject functions.
+                // By using static callbacks that are not bound to this instance
+                // and passing the target promise instance by reference, we can
+                // still execute its resolving logic and still clear this
+                // reference when settling the promise. This helps avoiding
+                // garbage cycles if any callback creates an Exception.
+                // These assumptions are covered by the test suite, so if you ever feel like
+                // refactoring this, go ahead, any alternative suggestions are welcome!
+                $target =& $this;
+                $progressHandlers =& $this->progressHandlers;
+
+                $callback(
+                    static function ($value = null) use (&$target) {
+                        if ($target !== null) {
+                            $target->settle(resolve($value));
+                            $target = null;
+                        }
+                    },
+                    static function ($reason = null) use (&$target) {
+                        if ($target !== null) {
+                            $target->reject($reason);
+                            $target = null;
+                        }
+                    },
+                    static function ($update = null) use (&$progressHandlers) {
+                        foreach ($progressHandlers as $handler) {
+                            $handler($update);
+                        }
+                    }
+                );
+            }
+        } catch (\Throwable $e) {
+            $target = null;
+            $this->reject($e);
+        } catch (\Exception $e) {
+            $target = null;
+            $this->reject($e);
+        }
+    }
+}

vendor/react/promise/src/PromiseInterface.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace React\Promise;
+
+interface PromiseInterface
+{
+    /**
+     * Transforms a promise's value by applying a function to the promise's fulfillment
+     * or rejection value. Returns a new promise for the transformed result.
+     *
+     * The `then()` method registers new fulfilled and rejection handlers with a promise
+     * (all parameters are optional):
+     *
+     *  * `$onFulfilled` will be invoked once the promise is fulfilled and passed
+     *     the result as the first argument.
+     *  * `$onRejected` will be invoked once the promise is rejected and passed the
+     *     reason as the first argument.
+     *  * `$onProgress` (deprecated) will be invoked whenever the producer of the promise
+     *     triggers progress notifications and passed a single argument (whatever it
+     *     wants) to indicate progress.
+     *
+     * It returns a new promise that will fulfill with the return value of either
+     * `$onFulfilled` or `$onRejected`, whichever is called, or will reject with
+     * the thrown exception if either throws.
+     *
+     * A promise makes the following guarantees about handlers registered in
+     * the same call to `then()`:
+     *
+     *  1. Only one of `$onFulfilled` or `$onRejected` will be called,
+     *      never both.
+     *  2. `$onFulfilled` and `$onRejected` will never be called more
+     *      than once.
+     *  3. `$onProgress` (deprecated) may be called multiple times.
+     *
+     * @param callable|null $onFulfilled
+     * @param callable|null $onRejected
+     * @param callable|null $onProgress This argument is deprecated and should not be used anymore.
+     * @return PromiseInterface
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null);
+}

vendor/react/promise/src/PromisorInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace React\Promise;
+
+interface PromisorInterface
+{
+    /**
+     * Returns the promise of the deferred.
+     *
+     * @return PromiseInterface
+     */
+    public function promise();
+}

vendor/react/promise/src/RejectedPromise.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace React\Promise;
+
+/**
+ * @deprecated 2.8.0 External usage of RejectedPromise is deprecated, use `reject()` instead.
+ */
+class RejectedPromise implements ExtendedPromiseInterface, CancellablePromiseInterface
+{
+    private $reason;
+
+    public function __construct($reason = null)
+    {
+        if ($reason instanceof PromiseInterface) {
+            throw new \InvalidArgumentException('You cannot create React\Promise\RejectedPromise with a promise. Use React\Promise\reject($promiseOrValue) instead.');
+        }
+
+        $this->reason = $reason;
+    }
+
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        if (null === $onRejected) {
+            return $this;
+        }
+
+        try {
+            return resolve($onRejected($this->reason));
+        } catch (\Throwable $exception) {
+            return new RejectedPromise($exception);
+        } catch (\Exception $exception) {
+            return new RejectedPromise($exception);
+        }
+    }
+
+    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        if (null === $onRejected) {
+            throw UnhandledRejectionException::resolve($this->reason);
+        }
+
+        $result = $onRejected($this->reason);
+
+        if ($result instanceof self) {
+            throw UnhandledRejectionException::resolve($result->reason);
+        }
+
+        if ($result instanceof ExtendedPromiseInterface) {
+            $result->done();
+        }
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        if (!_checkTypehint($onRejected, $this->reason)) {
+            return $this;
+        }
+
+        return $this->then(null, $onRejected);
+    }
+
+    public function always(callable $onFulfilledOrRejected)
+    {
+        return $this->then(null, function ($reason) use ($onFulfilledOrRejected) {
+            return resolve($onFulfilledOrRejected())->then(function () use ($reason) {
+                return new RejectedPromise($reason);
+            });
+        });
+    }
+
+    public function progress(callable $onProgress)
+    {
+        return $this;
+    }
+
+    public function cancel()
+    {
+    }
+}

vendor/react/promise/src/UnhandledRejectionException.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace React\Promise;
+
+class UnhandledRejectionException extends \RuntimeException
+{
+    private $reason;
+
+    public static function resolve($reason)
+    {
+        if ($reason instanceof \Exception || $reason instanceof \Throwable) {
+            return $reason;
+        }
+
+        return new static($reason);
+    }
+
+    public function __construct($reason)
+    {
+        $this->reason = $reason;
+
+        $message = \sprintf('Unhandled Rejection: %s', \json_encode($reason));
+
+        parent::__construct($message, 0);
+    }
+
+    public function getReason()
+    {
+        return $this->reason;
+    }
+}

vendor/react/promise/src/functions.php

@@ -0,0 +1,351 @@
+<?php
+
+namespace React\Promise;
+
+/**
+ * Creates a promise for the supplied `$promiseOrValue`.
+ *
+ * If `$promiseOrValue` is a value, it will be the resolution value of the
+ * returned promise.
+ *
+ * If `$promiseOrValue` is a thenable (any object that provides a `then()` method),
+ * a trusted promise that follows the state of the thenable is returned.
+ *
+ * If `$promiseOrValue` is a promise, it will be returned as is.
+ *
+ * @param mixed $promiseOrValue
+ * @return PromiseInterface
+ */
+function resolve($promiseOrValue = null)
+{
+    if ($promiseOrValue instanceof ExtendedPromiseInterface) {
+        return $promiseOrValue;
+    }
+
+    // Check is_object() first to avoid method_exists() triggering
+    // class autoloaders if $promiseOrValue is a string.
+    if (\is_object($promiseOrValue) && \method_exists($promiseOrValue, 'then')) {
+        $canceller = null;
+
+        if (\method_exists($promiseOrValue, 'cancel')) {
+            $canceller = [$promiseOrValue, 'cancel'];
+        }
+
+        return new Promise(function ($resolve, $reject, $notify) use ($promiseOrValue) {
+            $promiseOrValue->then($resolve, $reject, $notify);
+        }, $canceller);
+    }
+
+    return new FulfilledPromise($promiseOrValue);
+}
+
+/**
+ * Creates a rejected promise for the supplied `$promiseOrValue`.
+ *
+ * If `$promiseOrValue` is a value, it will be the rejection value of the
+ * returned promise.
+ *
+ * If `$promiseOrValue` is a promise, its completion value will be the rejected
+ * value of the returned promise.
+ *
+ * This can be useful in situations where you need to reject a promise without
+ * throwing an exception. For example, it allows you to propagate a rejection with
+ * the value of another promise.
+ *
+ * @param mixed $promiseOrValue
+ * @return PromiseInterface
+ */
+function reject($promiseOrValue = null)
+{
+    if ($promiseOrValue instanceof PromiseInterface) {
+        return resolve($promiseOrValue)->then(function ($value) {
+            return new RejectedPromise($value);
+        });
+    }
+
+    return new RejectedPromise($promiseOrValue);
+}
+
+/**
+ * Returns a promise that will resolve only once all the items in
+ * `$promisesOrValues` have resolved. The resolution value of the returned promise
+ * will be an array containing the resolution values of each of the items in
+ * `$promisesOrValues`.
+ *
+ * @param array $promisesOrValues
+ * @return PromiseInterface
+ */
+function all($promisesOrValues)
+{
+    return map($promisesOrValues, function ($val) {
+        return $val;
+    });
+}
+
+/**
+ * Initiates a competitive race that allows one winner. Returns a promise which is
+ * resolved in the same way the first settled promise resolves.
+ *
+ * The returned promise will become **infinitely pending** if  `$promisesOrValues`
+ * contains 0 items.
+ *
+ * @param array $promisesOrValues
+ * @return PromiseInterface
+ */
+function race($promisesOrValues)
+{
+    $cancellationQueue = new CancellationQueue();
+    $cancellationQueue->enqueue($promisesOrValues);
+
+    return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $cancellationQueue) {
+        resolve($promisesOrValues)
+            ->done(function ($array) use ($cancellationQueue, $resolve, $reject, $notify) {
+                if (!is_array($array) || !$array) {
+                    $resolve();
+                    return;
+                }
+
+                foreach ($array as $promiseOrValue) {
+                    $cancellationQueue->enqueue($promiseOrValue);
+
+                    resolve($promiseOrValue)
+                        ->done($resolve, $reject, $notify);
+                }
+            }, $reject, $notify);
+    }, $cancellationQueue);
+}
+
+/**
+ * Returns a promise that will resolve when any one of the items in
+ * `$promisesOrValues` resolves. The resolution value of the returned promise
+ * will be the resolution value of the triggering item.
+ *
+ * The returned promise will only reject if *all* items in `$promisesOrValues` are
+ * rejected. The rejection value will be an array of all rejection reasons.
+ *
+ * The returned promise will also reject with a `React\Promise\Exception\LengthException`
+ * if `$promisesOrValues` contains 0 items.
+ *
+ * @param array $promisesOrValues
+ * @return PromiseInterface
+ */
+function any($promisesOrValues)
+{
+    return some($promisesOrValues, 1)
+        ->then(function ($val) {
+            return \array_shift($val);
+        });
+}
+
+/**
+ * Returns a promise that will resolve when `$howMany` of the supplied items in
+ * `$promisesOrValues` resolve. The resolution value of the returned promise
+ * will be an array of length `$howMany` containing the resolution values of the
+ * triggering items.
+ *
+ * The returned promise will reject if it becomes impossible for `$howMany` items
+ * to resolve (that is, when `(count($promisesOrValues) - $howMany) + 1` items
+ * reject). The rejection value will be an array of
+ * `(count($promisesOrValues) - $howMany) + 1` rejection reasons.
+ *
+ * The returned promise will also reject with a `React\Promise\Exception\LengthException`
+ * if `$promisesOrValues` contains less items than `$howMany`.
+ *
+ * @param array $promisesOrValues
+ * @param int $howMany
+ * @return PromiseInterface
+ */
+function some($promisesOrValues, $howMany)
+{
+    $cancellationQueue = new CancellationQueue();
+    $cancellationQueue->enqueue($promisesOrValues);
+
+    return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $howMany, $cancellationQueue) {
+        resolve($promisesOrValues)
+            ->done(function ($array) use ($howMany, $cancellationQueue, $resolve, $reject, $notify) {
+                if (!\is_array($array) || $howMany < 1) {
+                    $resolve([]);
+                    return;
+                }
+
+                $len = \count($array);
+
+                if ($len < $howMany) {
+                    throw new Exception\LengthException(
+                        \sprintf(
+                            'Input array must contain at least %d item%s but contains only %s item%s.',
+                            $howMany,
+                            1 === $howMany ? '' : 's',
+                            $len,
+                            1 === $len ? '' : 's'
+                        )
+                    );
+                }
+
+                $toResolve = $howMany;
+                $toReject  = ($len - $toResolve) + 1;
+                $values    = [];
+                $reasons   = [];
+
+                foreach ($array as $i => $promiseOrValue) {
+                    $fulfiller = function ($val) use ($i, &$values, &$toResolve, $toReject, $resolve) {
+                        if ($toResolve < 1 || $toReject < 1) {
+                            return;
+                        }
+
+                        $values[$i] = $val;
+
+                        if (0 === --$toResolve) {
+                            $resolve($values);
+                        }
+                    };
+
+                    $rejecter = function ($reason) use ($i, &$reasons, &$toReject, $toResolve, $reject) {
+                        if ($toResolve < 1 || $toReject < 1) {
+                            return;
+                        }
+
+                        $reasons[$i] = $reason;
+
+                        if (0 === --$toReject) {
+                            $reject($reasons);
+                        }
+                    };
+
+                    $cancellationQueue->enqueue($promiseOrValue);
+
+                    resolve($promiseOrValue)
+                        ->done($fulfiller, $rejecter, $notify);
+                }
+            }, $reject, $notify);
+    }, $cancellationQueue);
+}
+
+/**
+ * Traditional map function, similar to `array_map()`, but allows input to contain
+ * promises and/or values, and `$mapFunc` may return either a value or a promise.
+ *
+ * The map function receives each item as argument, where item is a fully resolved
+ * value of a promise or value in `$promisesOrValues`.
+ *
+ * @param array $promisesOrValues
+ * @param callable $mapFunc
+ * @return PromiseInterface
+ */
+function map($promisesOrValues, callable $mapFunc)
+{
+    $cancellationQueue = new CancellationQueue();
+    $cancellationQueue->enqueue($promisesOrValues);
+
+    return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $mapFunc, $cancellationQueue) {
+        resolve($promisesOrValues)
+            ->done(function ($array) use ($mapFunc, $cancellationQueue, $resolve, $reject, $notify) {
+                if (!\is_array($array) || !$array) {
+                    $resolve([]);
+                    return;
+                }
+
+                $toResolve = \count($array);
+                $values    = [];
+
+                foreach ($array as $i => $promiseOrValue) {
+                    $cancellationQueue->enqueue($promiseOrValue);
+                    $values[$i] = null;
+
+                    resolve($promiseOrValue)
+                        ->then($mapFunc)
+                        ->done(
+                            function ($mapped) use ($i, &$values, &$toResolve, $resolve) {
+                                $values[$i] = $mapped;
+
+                                if (0 === --$toResolve) {
+                                    $resolve($values);
+                                }
+                            },
+                            $reject,
+                            $notify
+                        );
+                }
+            }, $reject, $notify);
+    }, $cancellationQueue);
+}
+
+/**
+ * Traditional reduce function, similar to `array_reduce()`, but input may contain
+ * promises and/or values, and `$reduceFunc` may return either a value or a
+ * promise, *and* `$initialValue` may be a promise or a value for the starting
+ * value.
+ *
+ * @param array $promisesOrValues
+ * @param callable $reduceFunc
+ * @param mixed $initialValue
+ * @return PromiseInterface
+ */
+function reduce($promisesOrValues, callable $reduceFunc, $initialValue = null)
+{
+    $cancellationQueue = new CancellationQueue();
+    $cancellationQueue->enqueue($promisesOrValues);
+
+    return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $reduceFunc, $initialValue, $cancellationQueue) {
+        resolve($promisesOrValues)
+            ->done(function ($array) use ($reduceFunc, $initialValue, $cancellationQueue, $resolve, $reject, $notify) {
+                if (!\is_array($array)) {
+                    $array = [];
+                }
+
+                $total = \count($array);
+                $i = 0;
+
+                // Wrap the supplied $reduceFunc with one that handles promises and then
+                // delegates to the supplied.
+                $wrappedReduceFunc = function ($current, $val) use ($reduceFunc, $cancellationQueue, $total, &$i) {
+                    $cancellationQueue->enqueue($val);
+
+                    return $current
+                        ->then(function ($c) use ($reduceFunc, $total, &$i, $val) {
+                            return resolve($val)
+                                ->then(function ($value) use ($reduceFunc, $total, &$i, $c) {
+                                    return $reduceFunc($c, $value, $i++, $total);
+                                });
+                        });
+                };
+
+                $cancellationQueue->enqueue($initialValue);
+
+                \array_reduce($array, $wrappedReduceFunc, resolve($initialValue))
+                    ->done($resolve, $reject, $notify);
+            }, $reject, $notify);
+    }, $cancellationQueue);
+}
+
+/**
+ * @internal
+ */
+function _checkTypehint(callable $callback, $object)
+{
+    if (!\is_object($object)) {
+        return true;
+    }
+
+    if (\is_array($callback)) {
+        $callbackReflection = new \ReflectionMethod($callback[0], $callback[1]);
+    } elseif (\is_object($callback) && !$callback instanceof \Closure) {
+        $callbackReflection = new \ReflectionMethod($callback, '__invoke');
+    } else {
+        $callbackReflection = new \ReflectionFunction($callback);
+    }
+
+    $parameters = $callbackReflection->getParameters();
+
+    if (!isset($parameters[0])) {
+        return true;
+    }
+
+    $expectedException = $parameters[0];
+
+    if (!$expectedException->getClass()) {
+        return true;
+    }
+
+    return $expectedException->getClass()->isInstance($object);
+}

vendor/react/promise/src/functions_include.php

@@ -0,0 +1,5 @@
+<?php
+
+if (!\function_exists('React\Promise\resolve')) {
+    require __DIR__.'/functions.php';
+}

vendor/react/promise/tests/CancellationQueueTest.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace React\Promise;
+
+class CancellationQueueTest extends TestCase
+{
+    /** @test */
+    public function acceptsSimpleCancellableThenable()
+    {
+        $p = new SimpleTestCancellableThenable();
+
+        $cancellationQueue = new CancellationQueue();
+        $cancellationQueue->enqueue($p);
+
+        $cancellationQueue();
+
+        $this->assertTrue($p->cancelCalled);
+    }
+
+    /** @test */
+    public function ignoresSimpleCancellable()
+    {
+        $p = new SimpleTestCancellable();
+
+        $cancellationQueue = new CancellationQueue();
+        $cancellationQueue->enqueue($p);
+
+        $cancellationQueue();
+
+        $this->assertFalse($p->cancelCalled);
+    }
+
+    /** @test */
+    public function callsCancelOnPromisesEnqueuedBeforeStart()
+    {
+        $d1 = $this->getCancellableDeferred();
+        $d2 = $this->getCancellableDeferred();
+
+        $cancellationQueue = new CancellationQueue();
+        $cancellationQueue->enqueue($d1->promise());
+        $cancellationQueue->enqueue($d2->promise());
+
+        $cancellationQueue();
+    }
+
+    /** @test */
+    public function callsCancelOnPromisesEnqueuedAfterStart()
+    {
+        $d1 = $this->getCancellableDeferred();
+        $d2 = $this->getCancellableDeferred();
+
+        $cancellationQueue = new CancellationQueue();
+
+        $cancellationQueue();
+
+        $cancellationQueue->enqueue($d2->promise());
+        $cancellationQueue->enqueue($d1->promise());
+    }
+
+    /** @test */
+    public function doesNotCallCancelTwiceWhenStartedTwice()
+    {
+        $d = $this->getCancellableDeferred();
+
+        $cancellationQueue = new CancellationQueue();
+        $cancellationQueue->enqueue($d->promise());
+
+        $cancellationQueue();
+        $cancellationQueue();
+    }
+
+    /** @test */
+    public function rethrowsExceptionsThrownFromCancel()
+    {
+        $this->setExpectedException('\Exception', 'test');
+
+        $mock = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock
+            ->expects($this->once())
+            ->method('cancel')
+            ->will($this->throwException(new \Exception('test')));
+
+        $cancellationQueue = new CancellationQueue();
+        $cancellationQueue->enqueue($mock);
+
+        $cancellationQueue();
+    }
+
+    private function getCancellableDeferred()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke');
+
+        return new Deferred($mock);
+    }
+}

vendor/react/promise/tests/DeferredTest.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\PromiseAdapter\CallbackPromiseAdapter;
+
+class DeferredTest extends TestCase
+{
+    use PromiseTest\FullTestTrait;
+
+    public function getPromiseTestAdapter(callable $canceller = null)
+    {
+        $d = new Deferred($canceller);
+
+        return new CallbackPromiseAdapter([
+            'promise' => [$d, 'promise'],
+            'resolve' => [$d, 'resolve'],
+            'reject'  => [$d, 'reject'],
+            'notify'  => [$d, 'progress'],
+            'settle'  => [$d, 'resolve'],
+        ]);
+    }
+
+    /** @test */
+    public function progressIsAnAliasForNotify()
+    {
+        $deferred = new Deferred();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        $deferred->promise()
+            ->then($this->expectCallableNever(), $this->expectCallableNever(), $mock);
+
+        $deferred->progress($sentinel);
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerRejectsWithException()
+    {
+        gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
+        $deferred = new Deferred(function ($resolve, $reject) {
+            $reject(new \Exception('foo'));
+        });
+        $deferred->promise()->cancel();
+        unset($deferred);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfParentCancellerRejectsWithException()
+    {
+        gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
+        $deferred = new Deferred(function ($resolve, $reject) {
+            $reject(new \Exception('foo'));
+        });
+        $deferred->promise()->then()->cancel();
+        unset($deferred);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerHoldsReferenceAndExplicitlyRejectWithException()
+    {
+        gc_collect_cycles();
+        $deferred = new Deferred(function () use (&$deferred) { });
+        $deferred->reject(new \Exception('foo'));
+        unset($deferred);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingDeferred()
+    {
+        gc_collect_cycles();
+        $deferred = new Deferred();
+        $deferred->promise();
+        unset($deferred);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingDeferredWithUnusedCanceller()
+    {
+        gc_collect_cycles();
+        $deferred = new Deferred(function () { });
+        $deferred->promise();
+        unset($deferred);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingDeferredWithNoopCanceller()
+    {
+        gc_collect_cycles();
+        $deferred = new Deferred(function () { });
+        $deferred->promise()->cancel();
+        unset($deferred);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+}

vendor/react/promise/tests/FulfilledPromiseTest.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\PromiseAdapter\CallbackPromiseAdapter;
+
+class FulfilledPromiseTest extends TestCase
+{
+    use PromiseTest\PromiseSettledTestTrait,
+        PromiseTest\PromiseFulfilledTestTrait;
+
+    public function getPromiseTestAdapter(callable $canceller = null)
+    {
+        $promise = null;
+
+        return new CallbackPromiseAdapter([
+            'promise' => function () use (&$promise) {
+                if (!$promise) {
+                    throw new \LogicException('FulfilledPromise must be resolved before obtaining the promise');
+                }
+
+                return $promise;
+            },
+            'resolve' => function ($value = null) use (&$promise) {
+                if (!$promise) {
+                    $promise = new FulfilledPromise($value);
+                }
+            },
+            'reject' => function () {
+                throw new \LogicException('You cannot call reject() for React\Promise\FulfilledPromise');
+            },
+            'notify' => function () {
+                // no-op
+            },
+            'settle' => function ($value = null) use (&$promise) {
+                if (!$promise) {
+                    $promise = new FulfilledPromise($value);
+                }
+            },
+        ]);
+    }
+
+    /** @test */
+    public function shouldThrowExceptionIfConstructedWithAPromise()
+    {
+        $this->setExpectedException('\InvalidArgumentException');
+
+        return new FulfilledPromise(new FulfilledPromise());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToFulfilledPromiseWithAlwaysFollowers()
+    {
+        gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
+        $promise = new FulfilledPromise(1);
+        $promise->always(function () {
+            throw new \RuntimeException();
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToFulfilledPromiseWithThenFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new FulfilledPromise(1);
+        $promise = $promise->then(function () {
+            throw new \RuntimeException();
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+}

vendor/react/promise/tests/FunctionAllTest.php

@@ -0,0 +1,114 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionAllTest extends TestCase
+{
+    /** @test */
+    public function shouldResolveEmptyInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([]));
+
+        all([])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveValuesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2, 3]));
+
+        all([1, 2, 3])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolvePromisesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2, 3]));
+
+        all([resolve(1), resolve(2), resolve(3)])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveSparseArrayInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([null, 1, null, 1, 1]));
+
+        all([null, 1, null, 1, 1])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectIfAnyInputPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        all([resolve(1), reject(2), resolve(3)])
+            ->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldAcceptAPromiseForAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2, 3]));
+
+        all(resolve([1, 2, 3]))
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveToEmptyArrayWhenInputPromiseDoesNotResolveToArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([]));
+
+        all(resolve(1))
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldPreserveTheOrderOfArrayWhenResolvingAsyncPromises()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2, 3]));
+
+        $deferred = new Deferred();
+
+        all([resolve(1), $deferred->promise(), resolve(3)])
+            ->then($mock);
+
+        $deferred->resolve(2);
+    }
+}

vendor/react/promise/tests/FunctionAnyTest.php

@@ -0,0 +1,204 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\Exception\LengthException;
+
+class FunctionAnyTest extends TestCase
+{
+    /** @test */
+    public function shouldRejectWithLengthExceptionWithEmptyInputArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with(
+                $this->callback(function($exception){
+                    return $exception instanceof LengthException &&
+                           'Input array must contain at least 1 item but contains only 0 items.' === $exception->getMessage();
+                })
+            );
+
+        any([])
+            ->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldResolveToNullWithNonArrayInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        any(null)
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveWithAnInputValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        any([1, 2, 3])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveWithAPromisedInputValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        any([resolve(1), resolve(2), resolve(3)])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectWithAllRejectedInputValuesIfAllInputsAreRejected()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([0 => 1, 1 => 2, 2 => 3]));
+
+        any([reject(1), reject(2), reject(3)])
+            ->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldResolveWhenFirstInputPromiseResolves()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        any([resolve(1), reject(2), reject(3)])
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldAcceptAPromiseForAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        any(resolve([1, 2, 3]))
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveToNullArrayWhenInputPromiseDoesNotResolveToArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        any(resolve(1))
+            ->then($mock);
+    }
+
+    /** @test */
+    public function shouldNotRelyOnArryIndexesWhenUnwrappingToASingleResolutionValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $d1 = new Deferred();
+        $d2 = new Deferred();
+
+        any(['abc' => $d1->promise(), 1 => $d2->promise()])
+            ->then($mock);
+
+        $d2->resolve(2);
+        $d1->resolve(1);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        any(reject())
+            ->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldCancelInputPromise()
+    {
+        $mock = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock
+            ->expects($this->once())
+            ->method('cancel');
+
+        any($mock)->cancel();
+    }
+
+    /** @test */
+    public function shouldCancelInputArrayPromises()
+    {
+        $mock1 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock1
+            ->expects($this->once())
+            ->method('cancel');
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->once())
+            ->method('cancel');
+
+        any([$mock1, $mock2])->cancel();
+    }
+
+    /** @test */
+    public function shouldNotCancelOtherPendingInputArrayPromisesIfOnePromiseFulfills()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->never())
+            ->method('__invoke');
+
+
+        $deferred = New Deferred($mock);
+        $deferred->resolve();
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->never())
+            ->method('cancel');
+
+        some([$deferred->promise(), $mock2], 1)->cancel();
+    }
+}

vendor/react/promise/tests/FunctionCheckTypehintTest.php

@@ -0,0 +1,118 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionCheckTypehintTest extends TestCase
+{
+    /** @test */
+    public function shouldAcceptClosureCallbackWithTypehint()
+    {
+        $this->assertTrue(_checkTypehint(function (\InvalidArgumentException $e) {
+                }, new \InvalidArgumentException()));
+        $this->assertfalse(_checkTypehint(function (\InvalidArgumentException $e) {
+                }, new \Exception()));
+    }
+
+    /** @test */
+    public function shouldAcceptFunctionStringCallbackWithTypehint()
+    {
+        $this->assertTrue(_checkTypehint('React\Promise\testCallbackWithTypehint', new \InvalidArgumentException()));
+        $this->assertfalse(_checkTypehint('React\Promise\testCallbackWithTypehint', new \Exception()));
+    }
+
+    /** @test */
+    public function shouldAcceptInvokableObjectCallbackWithTypehint()
+    {
+        $this->assertTrue(_checkTypehint(new TestCallbackWithTypehintClass(), new \InvalidArgumentException()));
+        $this->assertfalse(_checkTypehint(new TestCallbackWithTypehintClass(), new \Exception()));
+    }
+
+    /** @test */
+    public function shouldAcceptObjectMethodCallbackWithTypehint()
+    {
+        $this->assertTrue(_checkTypehint([new TestCallbackWithTypehintClass(), 'testCallback'], new \InvalidArgumentException()));
+        $this->assertfalse(_checkTypehint([new TestCallbackWithTypehintClass(), 'testCallback'], new \Exception()));
+    }
+
+    /** @test */
+    public function shouldAcceptStaticClassCallbackWithTypehint()
+    {
+        $this->assertTrue(_checkTypehint(['React\Promise\TestCallbackWithTypehintClass', 'testCallbackStatic'], new \InvalidArgumentException()));
+        $this->assertfalse(_checkTypehint(['React\Promise\TestCallbackWithTypehintClass', 'testCallbackStatic'], new \Exception()));
+    }
+
+    /** @test */
+    public function shouldAcceptClosureCallbackWithoutTypehint()
+    {
+        $this->assertTrue(_checkTypehint(function (\InvalidArgumentException $e) {
+        }, new \InvalidArgumentException()));
+    }
+
+    /** @test */
+    public function shouldAcceptFunctionStringCallbackWithoutTypehint()
+    {
+        $this->assertTrue(_checkTypehint('React\Promise\testCallbackWithoutTypehint', new \InvalidArgumentException()));
+    }
+
+    /** @test */
+    public function shouldAcceptInvokableObjectCallbackWithoutTypehint()
+    {
+        $this->assertTrue(_checkTypehint(new TestCallbackWithoutTypehintClass(), new \InvalidArgumentException()));
+    }
+
+    /** @test */
+    public function shouldAcceptObjectMethodCallbackWithoutTypehint()
+    {
+        $this->assertTrue(_checkTypehint([new TestCallbackWithoutTypehintClass(), 'testCallback'], new \InvalidArgumentException()));
+    }
+
+    /** @test */
+    public function shouldAcceptStaticClassCallbackWithoutTypehint()
+    {
+        $this->assertTrue(_checkTypehint(['React\Promise\TestCallbackWithoutTypehintClass', 'testCallbackStatic'], new \InvalidArgumentException()));
+    }
+}
+
+function testCallbackWithTypehint(\InvalidArgumentException $e)
+{
+}
+
+function testCallbackWithoutTypehint()
+{
+}
+
+class TestCallbackWithTypehintClass
+{
+    public function __invoke(\InvalidArgumentException $e)
+    {
+
+    }
+
+    public function testCallback(\InvalidArgumentException $e)
+    {
+
+    }
+
+    public static function testCallbackStatic(\InvalidArgumentException $e)
+    {
+
+    }
+}
+
+class TestCallbackWithoutTypehintClass
+{
+    public function __invoke()
+    {
+
+    }
+
+    public function testCallback()
+    {
+
+    }
+
+    public static function testCallbackStatic()
+    {
+
+    }
+}

vendor/react/promise/tests/FunctionMapTest.php

@@ -0,0 +1,198 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionMapTest extends TestCase
+{
+    protected function mapper()
+    {
+        return function ($val) {
+            return $val * 2;
+        };
+    }
+
+    protected function promiseMapper()
+    {
+        return function ($val) {
+            return resolve($val * 2);
+        };
+    }
+
+    /** @test */
+    public function shouldMapInputValuesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([2, 4, 6]));
+
+        map(
+            [1, 2, 3],
+            $this->mapper()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldMapInputPromisesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([2, 4, 6]));
+
+        map(
+            [resolve(1), resolve(2), resolve(3)],
+            $this->mapper()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldMapMixedInputArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([2, 4, 6]));
+
+        map(
+            [1, resolve(2), 3],
+            $this->mapper()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldMapInputWhenMapperReturnsAPromise()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([2, 4, 6]));
+
+        map(
+            [1, 2, 3],
+            $this->promiseMapper()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldAcceptAPromiseForAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([2, 4, 6]));
+
+        map(
+            resolve([1, resolve(2), 3]),
+            $this->mapper()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveToEmptyArrayWhenInputPromiseDoesNotResolveToArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([]));
+
+        map(
+            resolve(1),
+            $this->mapper()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldPreserveTheOrderOfArrayWhenResolvingAsyncPromises()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([2, 4, 6]));
+
+        $deferred = new Deferred();
+
+        map(
+            [resolve(1), $deferred->promise(), resolve(3)],
+            $this->mapper()
+        )->then($mock);
+
+        $deferred->resolve(2);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputContainsRejection()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        map(
+            [resolve(1), reject(2), resolve(3)],
+            $this->mapper()
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        map(
+            reject(),
+            $this->mapper()
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldCancelInputPromise()
+    {
+        $mock = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock
+            ->expects($this->once())
+            ->method('cancel');
+
+        map(
+            $mock,
+            $this->mapper()
+        )->cancel();
+    }
+
+    /** @test */
+    public function shouldCancelInputArrayPromises()
+    {
+        $mock1 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock1
+            ->expects($this->once())
+            ->method('cancel');
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->once())
+            ->method('cancel');
+
+        map(
+            [$mock1, $mock2],
+            $this->mapper()
+        )->cancel();
+    }
+}

vendor/react/promise/tests/FunctionRaceTest.php

@@ -0,0 +1,211 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionRaceTest extends TestCase
+{
+    /** @test */
+    public function shouldResolveEmptyInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        race(
+            []
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveValuesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        race(
+            [1, 2, 3]
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolvePromisesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $d1 = new Deferred();
+        $d2 = new Deferred();
+        $d3 = new Deferred();
+
+        race(
+            [$d1->promise(), $d2->promise(), $d3->promise()]
+        )->then($mock);
+
+        $d2->resolve(2);
+
+        $d1->resolve(1);
+        $d3->resolve(3);
+    }
+
+    /** @test */
+    public function shouldResolveSparseArrayInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        race(
+            [null, 1, null, 2, 3]
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectIfFirstSettledPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $d1 = new Deferred();
+        $d2 = new Deferred();
+        $d3 = new Deferred();
+
+        race(
+            [$d1->promise(), $d2->promise(), $d3->promise()]
+        )->then($this->expectCallableNever(), $mock);
+
+        $d2->reject(2);
+
+        $d1->resolve(1);
+        $d3->resolve(3);
+    }
+
+    /** @test */
+    public function shouldAcceptAPromiseForAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        race(
+            resolve([1, 2, 3])
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveToNullWhenInputPromiseDoesNotResolveToArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        race(
+            resolve(1)
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        race(
+            reject()
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldCancelInputPromise()
+    {
+        $mock = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock
+            ->expects($this->once())
+            ->method('cancel');
+
+        race($mock)->cancel();
+    }
+
+    /** @test */
+    public function shouldCancelInputArrayPromises()
+    {
+        $mock1 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock1
+            ->expects($this->once())
+            ->method('cancel');
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->once())
+            ->method('cancel');
+
+        race([$mock1, $mock2])->cancel();
+    }
+
+    /** @test */
+    public function shouldNotCancelOtherPendingInputArrayPromisesIfOnePromiseFulfills()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->never())
+            ->method('__invoke');
+
+        $deferred = New Deferred($mock);
+        $deferred->resolve();
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->never())
+            ->method('cancel');
+
+        race([$deferred->promise(), $mock2])->cancel();
+    }
+
+    /** @test */
+    public function shouldNotCancelOtherPendingInputArrayPromisesIfOnePromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->never())
+            ->method('__invoke');
+
+        $deferred = New Deferred($mock);
+        $deferred->reject();
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->never())
+            ->method('cancel');
+
+        race([$deferred->promise(), $mock2])->cancel();
+    }
+}

vendor/react/promise/tests/FunctionReduceTest.php

@@ -0,0 +1,347 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionReduceTest extends TestCase
+{
+    protected function plus()
+    {
+        return function ($sum, $val) {
+            return $sum + $val;
+        };
+    }
+
+    protected function append()
+    {
+        return function ($sum, $val) {
+            return $sum . $val;
+        };
+    }
+
+    /** @test */
+    public function shouldReduceValuesWithoutInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(6));
+
+        reduce(
+            [1, 2, 3],
+            $this->plus()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReduceValuesWithInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(7));
+
+        reduce(
+            [1, 2, 3],
+            $this->plus(),
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReduceValuesWithInitialPromise()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(7));
+
+        reduce(
+            [1, 2, 3],
+            $this->plus(),
+            resolve(1)
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReducePromisedValuesWithoutInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(6));
+
+        reduce(
+            [resolve(1), resolve(2), resolve(3)],
+            $this->plus()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReducePromisedValuesWithInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(7));
+
+        reduce(
+            [resolve(1), resolve(2), resolve(3)],
+            $this->plus(),
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReducePromisedValuesWithInitialPromise()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(7));
+
+        reduce(
+            [resolve(1), resolve(2), resolve(3)],
+            $this->plus(),
+            resolve(1)
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReduceEmptyInputWithInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        reduce(
+            [],
+            $this->plus(),
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReduceEmptyInputWithInitialPromise()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        reduce(
+            [],
+            $this->plus(),
+            resolve(1)
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputContainsRejection()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        reduce(
+            [resolve(1), reject(2), resolve(3)],
+            $this->plus(),
+            resolve(1)
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldResolveWithNullWhenInputIsEmptyAndNoInitialValueOrPromiseProvided()
+    {
+        // Note: this is different from when.js's behavior!
+        // In when.reduce(), this rejects with a TypeError exception (following
+        // JavaScript's [].reduce behavior.
+        // We're following PHP's array_reduce behavior and resolve with NULL.
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        reduce(
+            [],
+            $this->plus()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldAllowSparseArrayInputWithoutInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(3));
+
+        reduce(
+            [null, null, 1, null, 1, 1],
+            $this->plus()
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldAllowSparseArrayInputWithInitialValue()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(4));
+
+        reduce(
+            [null, null, 1, null, 1, 1],
+            $this->plus(),
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldReduceInInputOrder()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo('123'));
+
+        reduce(
+            [1, 2, 3],
+            $this->append(),
+            ''
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldAcceptAPromiseForAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo('123'));
+
+        reduce(
+            resolve([1, 2, 3]),
+            $this->append(),
+            ''
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveToInitialValueWhenInputPromiseDoesNotResolveToAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        reduce(
+            resolve(1),
+            $this->plus(),
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldProvideCorrectBasisValue()
+    {
+        $insertIntoArray = function ($arr, $val, $i) {
+            $arr[$i] = $val;
+
+            return $arr;
+        };
+
+        $d1 = new Deferred();
+        $d2 = new Deferred();
+        $d3 = new Deferred();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2, 3]));
+
+        reduce(
+            [$d1->promise(), $d2->promise(), $d3->promise()],
+            $insertIntoArray,
+            []
+        )->then($mock);
+
+        $d3->resolve(3);
+        $d1->resolve(1);
+        $d2->resolve(2);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        reduce(
+            reject(),
+            $this->plus(),
+            1
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldCancelInputPromise()
+    {
+        $mock = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock
+            ->expects($this->once())
+            ->method('cancel');
+
+        reduce(
+            $mock,
+            $this->plus(),
+            1
+        )->cancel();
+    }
+
+    /** @test */
+    public function shouldCancelInputArrayPromises()
+    {
+        $mock1 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock1
+            ->expects($this->once())
+            ->method('cancel');
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->once())
+            ->method('cancel');
+
+        reduce(
+            [$mock1, $mock2],
+            $this->plus(),
+            1
+        )->cancel();
+    }
+}

vendor/react/promise/tests/FunctionRejectTest.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionRejectTest extends TestCase
+{
+    /** @test */
+    public function shouldRejectAnImmediateValue()
+    {
+        $expected = 123;
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($expected));
+
+        reject($expected)
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+
+    /** @test */
+    public function shouldRejectAFulfilledPromise()
+    {
+        $expected = 123;
+
+        $resolved = new FulfilledPromise($expected);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($expected));
+
+        reject($resolved)
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+
+    /** @test */
+    public function shouldRejectARejectedPromise()
+    {
+        $expected = 123;
+
+        $resolved = new RejectedPromise($expected);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($expected));
+
+        reject($resolved)
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+}

vendor/react/promise/tests/FunctionResolveTest.php

@@ -0,0 +1,171 @@
+<?php
+
+namespace React\Promise;
+
+class FunctionResolveTest extends TestCase
+{
+    /** @test */
+    public function shouldResolveAnImmediateValue()
+    {
+        $expected = 123;
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($expected));
+
+        resolve($expected)
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function shouldResolveAFulfilledPromise()
+    {
+        $expected = 123;
+
+        $resolved = new FulfilledPromise($expected);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($expected));
+
+        resolve($resolved)
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function shouldResolveAThenable()
+    {
+        $thenable = new SimpleFulfilledTestThenable();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo('foo'));
+
+        resolve($thenable)
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function shouldResolveACancellableThenable()
+    {
+        $thenable = new SimpleTestCancellableThenable();
+
+        $promise = resolve($thenable);
+        $promise->cancel();
+
+        $this->assertTrue($thenable->cancelCalled);
+    }
+
+    /** @test */
+    public function shouldRejectARejectedPromise()
+    {
+        $expected = 123;
+
+        $resolved = new RejectedPromise($expected);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($expected));
+
+        resolve($resolved)
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+
+    /** @test */
+    public function shouldSupportDeepNestingInPromiseChains()
+    {
+        $d = new Deferred();
+        $d->resolve(false);
+
+        $result = resolve(resolve($d->promise()->then(function ($val) {
+            $d = new Deferred();
+            $d->resolve($val);
+
+            $identity = function ($val) {
+                return $val;
+            };
+
+            return resolve($d->promise()->then($identity))->then(
+                function ($val) {
+                    return !$val;
+                }
+            );
+        })));
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(true));
+
+        $result->then($mock);
+    }
+
+    /** @test */
+    public function shouldSupportVeryDeepNestedPromises()
+    {
+        $deferreds = [];
+
+        // @TODO Increase count once global-queue is merged
+        for ($i = 0; $i < 10; $i++) {
+            $deferreds[] = $d = new Deferred();
+            $p = $d->promise();
+
+            $last = $p;
+            for ($j = 0; $j < 10; $j++) {
+                $last = $last->then(function($result) {
+                    return $result;
+                });
+            }
+        }
+
+        $p = null;
+        foreach ($deferreds as $d) {
+            if ($p) {
+                $d->resolve($p);
+            }
+
+            $p = $d->promise();
+        }
+
+        $deferreds[0]->resolve(true);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(true));
+
+        $deferreds[0]->promise()->then($mock);
+    }
+
+    /** @test */
+    public function returnsExtendePromiseForSimplePromise()
+    {
+        $promise = $this
+            ->getMockBuilder('React\Promise\PromiseInterface')
+            ->getMock();
+
+        $this->assertInstanceOf('React\Promise\ExtendedPromiseInterface', resolve($promise));
+    }
+}

vendor/react/promise/tests/FunctionSomeTest.php

@@ -0,0 +1,258 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\Exception\LengthException;
+
+class FunctionSomeTest extends TestCase
+{
+    /** @test */
+    public function shouldRejectWithLengthExceptionWithEmptyInputArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with(
+                $this->callback(function($exception){
+                    return $exception instanceof LengthException &&
+                           'Input array must contain at least 1 item but contains only 0 items.' === $exception->getMessage();
+                })
+            );
+
+        some(
+            [],
+            1
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldRejectWithLengthExceptionWithInputArrayContainingNotEnoughItems()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with(
+                $this->callback(function($exception){
+                    return $exception instanceof LengthException &&
+                           'Input array must contain at least 4 items but contains only 3 items.' === $exception->getMessage();
+                })
+            );
+
+        some(
+            [1, 2, 3],
+            4
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldResolveToEmptyArrayWithNonArrayInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([]));
+
+        some(
+            null,
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveValuesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2]));
+
+        some(
+            [1, 2, 3],
+            2
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolvePromisesArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2]));
+
+        some(
+            [resolve(1), resolve(2), resolve(3)],
+            2
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveSparseArrayInput()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([null, 1]));
+
+        some(
+            [null, 1, null, 2, 3],
+            2
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectIfAnyInputPromiseRejectsBeforeDesiredNumberOfInputsAreResolved()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1 => 2, 2 => 3]));
+
+        some(
+            [resolve(1), reject(2), reject(3)],
+            2
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldAcceptAPromiseForAnArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([1, 2]));
+
+        some(
+            resolve([1, 2, 3]),
+            2
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveWithEmptyArrayIfHowManyIsLessThanOne()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([]));
+
+        some(
+            [1],
+            0
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldResolveToEmptyArrayWhenInputPromiseDoesNotResolveToArray()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo([]));
+
+        some(
+            resolve(1),
+            1
+        )->then($mock);
+    }
+
+    /** @test */
+    public function shouldRejectWhenInputPromiseRejects()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(null));
+
+        some(
+            reject(),
+            1
+        )->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldCancelInputPromise()
+    {
+        $mock = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock
+            ->expects($this->once())
+            ->method('cancel');
+
+        some($mock, 1)->cancel();
+    }
+
+    /** @test */
+    public function shouldCancelInputArrayPromises()
+    {
+        $mock1 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock1
+            ->expects($this->once())
+            ->method('cancel');
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->once())
+            ->method('cancel');
+
+        some([$mock1, $mock2], 1)->cancel();
+    }
+
+    /** @test */
+    public function shouldNotCancelOtherPendingInputArrayPromisesIfEnoughPromisesFulfill()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->never())
+            ->method('__invoke');
+
+        $deferred = New Deferred($mock);
+        $deferred->resolve();
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->never())
+            ->method('cancel');
+
+        some([$deferred->promise(), $mock2], 1);
+    }
+
+    /** @test */
+    public function shouldNotCancelOtherPendingInputArrayPromisesIfEnoughPromisesReject()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->never())
+            ->method('__invoke');
+
+        $deferred = New Deferred($mock);
+        $deferred->reject();
+
+        $mock2 = $this
+            ->getMockBuilder('React\Promise\CancellablePromiseInterface')
+            ->getMock();
+        $mock2
+            ->expects($this->never())
+            ->method('cancel');
+
+        some([$deferred->promise(), $mock2], 2);
+    }
+}

vendor/react/promise/tests/LazyPromiseTest.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\PromiseAdapter\CallbackPromiseAdapter;
+
+class LazyPromiseTest extends TestCase
+{
+    use PromiseTest\FullTestTrait;
+
+    public function getPromiseTestAdapter(callable $canceller = null)
+    {
+        $d = new Deferred($canceller);
+
+        $factory = function () use ($d) {
+            return $d->promise();
+        };
+
+        return new CallbackPromiseAdapter([
+            'promise'  => function () use ($factory) {
+                return new LazyPromise($factory);
+            },
+            'resolve' => [$d, 'resolve'],
+            'reject'  => [$d, 'reject'],
+            'notify'  => [$d, 'progress'],
+            'settle'  => [$d, 'resolve'],
+        ]);
+    }
+
+    /** @test */
+    public function shouldNotCallFactoryIfThenIsNotInvoked()
+    {
+        $factory = $this->createCallableMock();
+        $factory
+            ->expects($this->never())
+            ->method('__invoke');
+
+        new LazyPromise($factory);
+    }
+
+    /** @test */
+    public function shouldCallFactoryIfThenIsInvoked()
+    {
+        $factory = $this->createCallableMock();
+        $factory
+            ->expects($this->once())
+            ->method('__invoke');
+
+        $p = new LazyPromise($factory);
+        $p->then();
+    }
+
+    /** @test */
+    public function shouldReturnPromiseFromFactory()
+    {
+        $factory = $this->createCallableMock();
+        $factory
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->returnValue(new FulfilledPromise(1)));
+
+        $onFulfilled = $this->createCallableMock();
+        $onFulfilled
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $p = new LazyPromise($factory);
+
+        $p->then($onFulfilled);
+    }
+
+    /** @test */
+    public function shouldReturnPromiseIfFactoryReturnsNull()
+    {
+        $factory = $this->createCallableMock();
+        $factory
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->returnValue(null));
+
+        $p = new LazyPromise($factory);
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $p->then());
+    }
+
+    /** @test */
+    public function shouldReturnRejectedPromiseIfFactoryThrowsException()
+    {
+        $exception = new \Exception();
+
+        $factory = $this->createCallableMock();
+        $factory
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->throwException($exception));
+
+        $onRejected = $this->createCallableMock();
+        $onRejected
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $p = new LazyPromise($factory);
+
+        $p->then($this->expectCallableNever(), $onRejected);
+    }
+}

vendor/react/promise/tests/PromiseAdapter/CallbackPromiseAdapter.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace React\Promise\PromiseAdapter;
+
+use React\Promise;
+
+class CallbackPromiseAdapter implements PromiseAdapterInterface
+{
+    private $callbacks;
+
+    public function __construct(array $callbacks)
+    {
+        $this->callbacks = $callbacks;
+    }
+
+    public function promise()
+    {
+        return call_user_func_array($this->callbacks['promise'], func_get_args());
+    }
+
+    public function resolve()
+    {
+        return call_user_func_array($this->callbacks['resolve'], func_get_args());
+    }
+
+    public function reject()
+    {
+        return call_user_func_array($this->callbacks['reject'], func_get_args());
+    }
+
+    public function notify()
+    {
+        return call_user_func_array($this->callbacks['notify'], func_get_args());
+    }
+
+    public function settle()
+    {
+        return call_user_func_array($this->callbacks['settle'], func_get_args());
+    }
+}

vendor/react/promise/tests/PromiseAdapter/PromiseAdapterInterface.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace React\Promise\PromiseAdapter;
+
+use React\Promise;
+
+interface PromiseAdapterInterface
+{
+    public function promise();
+    public function resolve();
+    public function reject();
+    public function notify();
+    public function settle();
+}

vendor/react/promise/tests/PromiseTest.php

@@ -0,0 +1,295 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\PromiseAdapter\CallbackPromiseAdapter;
+
+class PromiseTest extends TestCase
+{
+    use PromiseTest\FullTestTrait;
+
+    public function getPromiseTestAdapter(callable $canceller = null)
+    {
+        $resolveCallback = $rejectCallback = $progressCallback = null;
+
+        $promise = new Promise(function ($resolve, $reject, $progress) use (&$resolveCallback, &$rejectCallback, &$progressCallback) {
+            $resolveCallback  = $resolve;
+            $rejectCallback   = $reject;
+            $progressCallback = $progress;
+        }, $canceller);
+
+        return new CallbackPromiseAdapter([
+            'promise' => function () use ($promise) {
+                return $promise;
+            },
+            'resolve' => $resolveCallback,
+            'reject'  => $rejectCallback,
+            'notify'  => $progressCallback,
+            'settle'  => $resolveCallback,
+        ]);
+    }
+
+    /** @test */
+    public function shouldRejectIfResolverThrowsException()
+    {
+        $exception = new \Exception('foo');
+
+        $promise = new Promise(function () use ($exception) {
+            throw $exception;
+        });
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $promise
+            ->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldResolveWithoutCreatingGarbageCyclesIfResolverResolvesWithException()
+    {
+        gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
+        $promise = new Promise(function ($resolve) {
+            $resolve(new \Exception('foo'));
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfResolverThrowsExceptionWithoutResolver()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () {
+            throw new \Exception('foo');
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfResolverRejectsWithException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function ($resolve, $reject) {
+            $reject(new \Exception('foo'));
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerRejectsWithException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function ($resolve, $reject) { }, function ($resolve, $reject) {
+            $reject(new \Exception('foo'));
+        });
+        $promise->cancel();
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfParentCancellerRejectsWithException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function ($resolve, $reject) { }, function ($resolve, $reject) {
+            $reject(new \Exception('foo'));
+        });
+        $promise->then()->then()->then()->cancel();
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfResolverThrowsException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function ($resolve, $reject) {
+            throw new \Exception('foo');
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /**
+     * Test that checks number of garbage cycles after throwing from a canceller
+     * that explicitly uses a reference to the promise. This is rather synthetic,
+     * actual use cases often have implicit (hidden) references which ought not
+     * to be stored in the stack trace.
+     *
+     * Reassigned arguments only show up in the stack trace in PHP 7, so we can't
+     * avoid this on legacy PHP. As an alternative, consider explicitly unsetting
+     * any references before throwing.
+     *
+     * @test
+     * @requires PHP 7
+     */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerWithReferenceThrowsException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () {}, function () use (&$promise) {
+            throw new \Exception('foo');
+        });
+        $promise->cancel();
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /**
+     * @test
+     * @requires PHP 7
+     * @see self::shouldRejectWithoutCreatingGarbageCyclesIfCancellerWithReferenceThrowsException
+     */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfResolverWithReferenceThrowsException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () use (&$promise) {
+            throw new \Exception('foo');
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /**
+     * @test
+     * @requires PHP 7
+     * @see self::shouldRejectWithoutCreatingGarbageCyclesIfCancellerWithReferenceThrowsException
+     */
+    public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerHoldsReferenceAndResolverThrowsException()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () {
+            throw new \Exception('foo');
+        }, function () use (&$promise) { });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldIgnoreNotifyAfterReject()
+    {
+        $promise = new Promise(function () { }, function ($resolve, $reject, $notify) {
+            $reject(new \Exception('foo'));
+            $notify(42);
+        });
+
+        $promise->then(null, null, $this->expectCallableNever());
+        $promise->cancel();
+    }
+
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingPromise()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () { });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingPromiseWithThenFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () { });
+        $promise->then()->then()->then();
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingPromiseWithDoneFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () { });
+        $promise->done();
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingPromiseWithOtherwiseFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () { });
+        $promise->otherwise(function () { });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingPromiseWithAlwaysFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () { });
+        $promise->always(function () { });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToPendingPromiseWithProgressFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new Promise(function () { });
+        $promise->then(null, null, function () { });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldFulfillIfFullfilledWithSimplePromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo('foo'));
+
+        $adapter->promise()
+            ->then($mock);
+
+        $adapter->resolve(new SimpleFulfilledTestPromise());
+    }
+
+    /** @test */
+    public function shouldRejectIfRejectedWithSimplePromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo('foo'));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->resolve(new SimpleRejectedTestPromise());
+    }
+}

vendor/react/promise/tests/PromiseTest/CancelTestTrait.php

@@ -0,0 +1,246 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+use React\Promise;
+
+trait CancelTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function cancelShouldCallCancellerWithResolverArguments()
+    {
+        $args = null;
+        $adapter = $this->getPromiseTestAdapter(function ($resolve, $reject, $notify) use (&$args) {
+            $args = func_get_args();
+        });
+
+        $adapter->promise()->cancel();
+
+        $this->assertCount(3, $args);
+        $this->assertTrue(is_callable($args[0]));
+        $this->assertTrue(is_callable($args[1]));
+        $this->assertTrue(is_callable($args[2]));
+    }
+
+    /** @test */
+    public function cancelShouldCallCancellerWithoutArgumentsIfNotAccessed()
+    {
+        $args = null;
+        $adapter = $this->getPromiseTestAdapter(function () use (&$args) {
+            $args = func_num_args();
+        });
+
+        $adapter->promise()->cancel();
+
+        $this->assertSame(0, $args);
+    }
+
+    /** @test */
+    public function cancelShouldFulfillPromiseIfCancellerFulfills()
+    {
+        $adapter = $this->getPromiseTestAdapter(function ($resolve) {
+            $resolve(1);
+        });
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($mock, $this->expectCallableNever());
+
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldRejectPromiseIfCancellerRejects()
+    {
+        $adapter = $this->getPromiseTestAdapter(function ($resolve, $reject) {
+            $reject(1);
+        });
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldRejectPromiseWithExceptionIfCancellerThrows()
+    {
+        $e = new \Exception();
+
+        $adapter = $this->getPromiseTestAdapter(function () use ($e) {
+            throw $e;
+        });
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($e));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldProgressPromiseIfCancellerNotifies()
+    {
+        $adapter = $this->getPromiseTestAdapter(function ($resolve, $reject, $progress) {
+            $progress(1);
+        });
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $this->expectCallableNever(), $mock);
+
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldCallCancellerOnlyOnceIfCancellerResolves()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->returnCallback(function ($resolve) {
+                $resolve();
+            }));
+
+        $adapter = $this->getPromiseTestAdapter($mock);
+
+        $adapter->promise()->cancel();
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldHaveNoEffectIfCancellerDoesNothing()
+    {
+        $adapter = $this->getPromiseTestAdapter(function () {});
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $this->expectCallableNever());
+
+        $adapter->promise()->cancel();
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldCallCancellerFromDeepNestedPromiseChain()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke');
+
+        $adapter = $this->getPromiseTestAdapter($mock);
+
+        $promise = $adapter->promise()
+            ->then(function () {
+                return new Promise\Promise(function () {});
+            })
+            ->then(function () {
+                $d = new Promise\Deferred();
+
+                return $d->promise();
+            })
+            ->then(function () {
+                return new Promise\Promise(function () {});
+            });
+
+        $promise->cancel();
+    }
+
+    /** @test */
+    public function cancelCalledOnChildrenSouldOnlyCancelWhenAllChildrenCancelled()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableNever());
+
+        $child1 = $adapter->promise()
+            ->then()
+            ->then();
+
+        $adapter->promise()
+            ->then();
+
+        $child1->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldTriggerCancellerWhenAllChildrenCancel()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableOnce());
+
+        $child1 = $adapter->promise()
+            ->then()
+            ->then();
+
+        $child2 = $adapter->promise()
+            ->then();
+
+        $child1->cancel();
+        $child2->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldNotTriggerCancellerWhenCancellingOneChildrenMultipleTimes()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableNever());
+
+        $child1 = $adapter->promise()
+            ->then()
+            ->then();
+
+        $child2 = $adapter->promise()
+            ->then();
+
+        $child1->cancel();
+        $child1->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldTriggerCancellerOnlyOnceWhenCancellingMultipleTimes()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableOnce());
+
+        $adapter->promise()->cancel();
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function cancelShouldAlwaysTriggerCancellerWhenCalledOnRootPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableOnce());
+
+        $adapter->promise()
+            ->then()
+            ->then();
+
+        $adapter->promise()
+            ->then();
+
+        $adapter->promise()->cancel();
+    }
+}

vendor/react/promise/tests/PromiseTest/FullTestTrait.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+trait FullTestTrait
+{
+    use PromisePendingTestTrait,
+        PromiseSettledTestTrait,
+        PromiseFulfilledTestTrait,
+        PromiseRejectedTestTrait,
+        ResolveTestTrait,
+        RejectTestTrait,
+        NotifyTestTrait,
+        CancelTestTrait;
+}

vendor/react/promise/tests/PromiseTest/NotifyTestTrait.php

@@ -0,0 +1,336 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+trait NotifyTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function notifyShouldProgress()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $this->expectCallableNever(), $mock);
+
+        $adapter->notify($sentinel);
+    }
+
+    /** @test */
+    public function notifyShouldPropagateProgressToDownstreamPromises()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->returnArgument(0));
+
+        $mock2 = $this->createCallableMock();
+        $mock2
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock2
+            );
+
+        $adapter->notify($sentinel);
+    }
+
+    /** @test */
+    public function notifyShouldPropagateTransformedProgressToDownstreamPromises()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->returnValue($sentinel));
+
+        $mock2 = $this->createCallableMock();
+        $mock2
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock2
+            );
+
+        $adapter->notify(1);
+    }
+
+    /** @test */
+    public function notifyShouldPropagateCaughtExceptionValueAsProgress()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->throwException($exception));
+
+        $mock2 = $this->createCallableMock();
+        $mock2
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock2
+            );
+
+        $adapter->notify(1);
+    }
+
+    /** @test */
+    public function notifyShouldForwardProgressEventsWhenIntermediaryCallbackTiedToAResolvedPromiseReturnsAPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+        $adapter2 = $this->getPromiseTestAdapter();
+
+        $promise2 = $adapter2->promise();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        // resolve BEFORE attaching progress handler
+        $adapter->resolve();
+
+        $adapter->promise()
+            ->then(function () use ($promise2) {
+                return $promise2;
+            })
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        $adapter2->notify($sentinel);
+    }
+
+    /** @test */
+    public function notifyShouldForwardProgressEventsWhenIntermediaryCallbackTiedToAnUnresolvedPromiseReturnsAPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+        $adapter2 = $this->getPromiseTestAdapter();
+
+        $promise2 = $adapter2->promise();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        $adapter->promise()
+            ->then(function () use ($promise2) {
+                return $promise2;
+            })
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        // resolve AFTER attaching progress handler
+        $adapter->resolve();
+        $adapter2->notify($sentinel);
+    }
+
+    /** @test */
+    public function notifyShouldForwardProgressWhenResolvedWithAnotherPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+        $adapter2 = $this->getPromiseTestAdapter();
+
+        $sentinel = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->returnValue($sentinel));
+
+        $mock2 = $this->createCallableMock();
+        $mock2
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($sentinel);
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $this->expectCallableNever(),
+                $mock2
+            );
+
+        $adapter->resolve($adapter2->promise());
+        $adapter2->notify($sentinel);
+    }
+
+    /** @test */
+    public function notifyShouldAllowResolveAfterProgress()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->at(0))
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+        $mock
+            ->expects($this->at(1))
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->promise()
+            ->then(
+                $mock,
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        $adapter->notify(1);
+        $adapter->resolve(2);
+    }
+
+    /** @test */
+    public function notifyShouldAllowRejectAfterProgress()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->at(0))
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+        $mock
+            ->expects($this->at(1))
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $mock,
+                $mock
+            );
+
+        $adapter->notify(1);
+        $adapter->reject(2);
+    }
+
+    /** @test */
+    public function notifyShouldReturnSilentlyOnProgressWhenAlreadyRejected()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->reject(1);
+
+        $this->assertNull($adapter->notify());
+    }
+
+    /** @test */
+    public function notifyShouldInvokeProgressHandler()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()->progress($mock);
+        $adapter->notify(1);
+    }
+
+    /** @test */
+    public function notifyShouldInvokeProgressHandlerFromDone()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $this->assertNull($adapter->promise()->done(null, null, $mock));
+        $adapter->notify(1);
+    }
+
+    /** @test */
+    public function notifyShouldThrowExceptionThrownProgressHandlerFromDone()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done(null, null, function () {
+            throw new \Exception('UnhandledRejectionException');
+        }));
+        $adapter->notify(1);
+    }
+}

vendor/react/promise/tests/PromiseTest/PromiseFulfilledTestTrait.php

@@ -0,0 +1,351 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+trait PromiseFulfilledTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function fulfilledPromiseShouldBeImmutable()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->resolve(1);
+        $adapter->resolve(2);
+
+        $adapter->promise()
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function fulfilledPromiseShouldInvokeNewlyAddedCallback()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->resolve(1);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($mock, $this->expectCallableNever());
+    }
+
+    /** @test */
+    public function thenShouldForwardResultWhenCallbackIsNull()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->then(
+                null,
+                $this->expectCallableNever()
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function thenShouldForwardCallbackResultToNextCallback()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->then(
+                function ($val) {
+                    return $val + 1;
+                },
+                $this->expectCallableNever()
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function thenShouldForwardPromisedCallbackResultValueToNextCallback()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->then(
+                function ($val) {
+                    return \React\Promise\resolve($val + 1);
+                },
+                $this->expectCallableNever()
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function thenShouldSwitchFromCallbacksToErrbacksWhenCallbackReturnsARejection()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->then(
+                function ($val) {
+                    return \React\Promise\reject($val + 1);
+                },
+                $this->expectCallableNever()
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+
+    /** @test */
+    public function thenShouldSwitchFromCallbacksToErrbacksWhenCallbackThrows()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->throwException($exception));
+
+        $mock2 = $this->createCallableMock();
+        $mock2
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $mock2
+            );
+    }
+
+    /** @test */
+    public function cancelShouldReturnNullForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->resolve();
+
+        $this->assertNull($adapter->promise()->cancel());
+    }
+
+    /** @test */
+    public function cancelShouldHaveNoEffectForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableNever());
+
+        $adapter->resolve();
+
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function doneShouldInvokeFulfillmentHandlerForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->resolve(1);
+        $this->assertNull($adapter->promise()->done($mock));
+    }
+
+    /** @test */
+    public function doneShouldThrowExceptionThrownFulfillmentHandlerForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $adapter->resolve(1);
+        $this->assertNull($adapter->promise()->done(function () {
+            throw new \Exception('UnhandledRejectionException');
+        }));
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenFulfillmentHandlerRejectsForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $adapter->resolve(1);
+        $this->assertNull($adapter->promise()->done(function () {
+            return \React\Promise\reject();
+        }));
+    }
+
+    /** @test */
+    public function otherwiseShouldNotInvokeRejectionHandlerForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->resolve(1);
+        $adapter->promise()->otherwise($this->expectCallableNever());
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressValueForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $value = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($value));
+
+        $adapter->resolve($value);
+        $adapter->promise()
+            ->always(function () {})
+            ->then($mock);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressValueWhenHandlerReturnsANonPromiseForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $value = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($value));
+
+        $adapter->resolve($value);
+        $adapter->promise()
+            ->always(function () {
+                return 1;
+            })
+            ->then($mock);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressValueWhenHandlerReturnsAPromiseForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $value = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($value));
+
+        $adapter->resolve($value);
+        $adapter->promise()
+            ->always(function () {
+                return \React\Promise\resolve(1);
+            })
+            ->then($mock);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerThrowsForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->always(function () use ($exception) {
+                throw $exception;
+            })
+            ->then(null, $mock);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerRejectsForFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->resolve(1);
+        $adapter->promise()
+            ->always(function () use ($exception) {
+                return \React\Promise\reject($exception);
+            })
+            ->then(null, $mock);
+    }
+}

vendor/react/promise/tests/PromiseTest/PromisePendingTestTrait.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+trait PromisePendingTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function thenShouldReturnAPromiseForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $adapter->promise()->then());
+    }
+
+    /** @test */
+    public function thenShouldReturnAllowNullForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $adapter->promise()->then(null, null, null));
+    }
+
+    /** @test */
+    public function cancelShouldReturnNullForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertNull($adapter->promise()->cancel());
+    }
+
+    /** @test */
+    public function doneShouldReturnNullForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertNull($adapter->promise()->done());
+    }
+
+    /** @test */
+    public function doneShouldReturnAllowNullForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertNull($adapter->promise()->done(null, null, null));
+    }
+
+    /** @test */
+    public function otherwiseShouldNotInvokeRejectionHandlerForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $adapter->promise()->otherwise($this->expectCallableNever());
+    }
+
+    /** @test */
+    public function alwaysShouldReturnAPromiseForPendingPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $adapter->promise()->always(function () {}));
+    }
+}

vendor/react/promise/tests/PromiseTest/PromiseRejectedTestTrait.php

@@ -0,0 +1,512 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+use React\Promise\Deferred;
+use React\Promise\UnhandledRejectionException;
+
+trait PromiseRejectedTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function rejectedPromiseShouldBeImmutable()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->reject(1);
+        $adapter->reject(2);
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+
+    /** @test */
+    public function rejectedPromiseShouldInvokeNewlyAddedCallback()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->reject(1);
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+    }
+
+    /** @test */
+    public function shouldForwardUndefinedRejectionValue()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with(null);
+
+        $adapter->reject(1);
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                function () {
+                    // Presence of rejection handler is enough to switch back
+                    // to resolve mode, even though it returns undefined.
+                    // The ONLY way to propagate a rejection is to re-throw or
+                    // return a rejected promise;
+                }
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function shouldSwitchFromErrbacksToCallbacksWhenErrbackDoesNotExplicitlyPropagate()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->reject(1);
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                function ($val) {
+                    return $val + 1;
+                }
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function shouldSwitchFromErrbacksToCallbacksWhenErrbackReturnsAResolution()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->reject(1);
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                function ($val) {
+                    return \React\Promise\resolve($val + 1);
+                }
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+    }
+
+    /** @test */
+    public function shouldPropagateRejectionsWhenErrbackThrows()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->will($this->throwException($exception));
+
+        $mock2 = $this->createCallableMock();
+        $mock2
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->reject(1);
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $mock2
+            );
+    }
+
+    /** @test */
+    public function shouldPropagateRejectionsWhenErrbackReturnsARejection()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(2));
+
+        $adapter->reject(1);
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                function ($val) {
+                    return \React\Promise\reject($val + 1);
+                }
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+    }
+
+    /** @test */
+    public function doneShouldInvokeRejectionHandlerForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->reject(1);
+        $this->assertNull($adapter->promise()->done(null, $mock));
+    }
+
+    /** @test */
+    public function doneShouldThrowExceptionThrownByRejectionHandlerForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $adapter->reject(1);
+        $this->assertNull($adapter->promise()->done(null, function () {
+            throw new \Exception('UnhandledRejectionException');
+        }));
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenRejectedWithNonExceptionForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $adapter->reject(1);
+        $this->assertNull($adapter->promise()->done());
+    }
+
+    /** @test */
+    public function unhandledRejectionExceptionThrownByDoneHoldsRejectionValue()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $expected = new \stdClass();
+
+        $adapter->reject($expected);
+
+        try {
+            $adapter->promise()->done();
+        } catch (UnhandledRejectionException $e) {
+            $this->assertSame($expected, $e->getReason());
+            return;
+        }
+
+        $this->fail();
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenRejectionHandlerRejectsForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $adapter->reject(1);
+        $this->assertNull($adapter->promise()->done(null, function () {
+            return \React\Promise\reject();
+        }));
+    }
+
+    /** @test */
+    public function doneShouldThrowRejectionExceptionWhenRejectionHandlerRejectsWithExceptionForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $adapter->reject(1);
+        $this->assertNull($adapter->promise()->done(null, function () {
+            return \React\Promise\reject(new \Exception('UnhandledRejectionException'));
+        }));
+    }
+
+    /** @test */
+    public function doneShouldThrowExceptionProvidedAsRejectionValueForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $adapter->reject(new \Exception('UnhandledRejectionException'));
+        $this->assertNull($adapter->promise()->done());
+    }
+
+    /** @test */
+    public function doneShouldThrowWithDeepNestingPromiseChainsForRejectedPromise()
+    {
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $exception = new \Exception('UnhandledRejectionException');
+
+        $d = new Deferred();
+        $d->resolve();
+
+        $result = \React\Promise\resolve(\React\Promise\resolve($d->promise()->then(function () use ($exception) {
+            $d = new Deferred();
+            $d->resolve();
+
+            return \React\Promise\resolve($d->promise()->then(function () {}))->then(
+                function () use ($exception) {
+                    throw $exception;
+                }
+            );
+        })));
+
+        $result->done();
+    }
+
+    /** @test */
+    public function doneShouldRecoverWhenRejectionHandlerCatchesExceptionForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->reject(new \Exception('UnhandledRejectionException'));
+        $this->assertNull($adapter->promise()->done(null, function (\Exception $e) {
+
+        }));
+    }
+
+    /** @test */
+    public function otherwiseShouldInvokeRejectionHandlerForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->reject(1);
+        $adapter->promise()->otherwise($mock);
+    }
+
+    /** @test */
+    public function otherwiseShouldInvokeNonTypeHintedRejectionHandlerIfReasonIsAnExceptionForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->reject($exception);
+        $adapter->promise()
+            ->otherwise(function ($reason) use ($mock) {
+                $mock($reason);
+            });
+    }
+
+    /** @test */
+    public function otherwiseShouldInvokeRejectionHandlerIfReasonMatchesTypehintForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \InvalidArgumentException();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->reject($exception);
+        $adapter->promise()
+            ->otherwise(function (\InvalidArgumentException $reason) use ($mock) {
+                $mock($reason);
+            });
+    }
+
+    /** @test */
+    public function otherwiseShouldNotInvokeRejectionHandlerIfReaonsDoesNotMatchTypehintForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->expectCallableNever();
+
+        $adapter->reject($exception);
+        $adapter->promise()
+            ->otherwise(function (\InvalidArgumentException $reason) use ($mock) {
+                $mock($reason);
+            });
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressRejectionForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->reject($exception);
+        $adapter->promise()
+            ->always(function () {})
+            ->then(null, $mock);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressRejectionWhenHandlerReturnsANonPromiseForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->reject($exception);
+        $adapter->promise()
+            ->always(function () {
+                return 1;
+            })
+            ->then(null, $mock);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressRejectionWhenHandlerReturnsAPromiseForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->reject($exception);
+        $adapter->promise()
+            ->always(function () {
+                return \React\Promise\resolve(1);
+            })
+            ->then(null, $mock);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerThrowsForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception1 = new \Exception();
+        $exception2 = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception2));
+
+        $adapter->reject($exception1);
+        $adapter->promise()
+            ->always(function () use ($exception2) {
+                throw $exception2;
+            })
+            ->then(null, $mock);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerRejectsForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception1 = new \Exception();
+        $exception2 = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception2));
+
+        $adapter->reject($exception1);
+        $adapter->promise()
+            ->always(function () use ($exception2) {
+                return \React\Promise\reject($exception2);
+            })
+            ->then(null, $mock);
+    }
+
+    /** @test */
+    public function cancelShouldReturnNullForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->reject();
+
+        $this->assertNull($adapter->promise()->cancel());
+    }
+
+    /** @test */
+    public function cancelShouldHaveNoEffectForRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableNever());
+
+        $adapter->reject();
+
+        $adapter->promise()->cancel();
+    }
+}

vendor/react/promise/tests/PromiseTest/PromiseSettledTestTrait.php

@@ -0,0 +1,86 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+trait PromiseSettledTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function thenShouldReturnAPromiseForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $adapter->promise()->then());
+    }
+
+    /** @test */
+    public function thenShouldReturnAllowNullForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $adapter->promise()->then(null, null, null));
+    }
+
+    /** @test */
+    public function cancelShouldReturnNullForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+
+        $this->assertNull($adapter->promise()->cancel());
+    }
+
+    /** @test */
+    public function cancelShouldHaveNoEffectForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter($this->expectCallableNever());
+
+        $adapter->settle();
+
+        $adapter->promise()->cancel();
+    }
+
+    /** @test */
+    public function doneShouldReturnNullForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $this->assertNull($adapter->promise()->done(null, function () {}));
+    }
+
+    /** @test */
+    public function doneShouldReturnAllowNullForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $this->assertNull($adapter->promise()->done(null, function () {}, null));
+    }
+
+    /** @test */
+    public function progressShouldNotInvokeProgressHandlerForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $adapter->promise()->progress($this->expectCallableNever());
+        $adapter->notify();
+    }
+
+    /** @test */
+    public function alwaysShouldReturnAPromiseForSettledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $adapter->settle();
+        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $adapter->promise()->always(function () {}));
+    }
+}

vendor/react/promise/tests/PromiseTest/RejectTestTrait.php

@@ -0,0 +1,368 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+use React\Promise;
+use React\Promise\Deferred;
+
+trait RejectTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function rejectShouldRejectWithAnImmediateValue()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function rejectShouldRejectWithFulfilledPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->reject(Promise\resolve(1));
+    }
+
+    /** @test */
+    public function rejectShouldRejectWithRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->reject(Promise\reject(1));
+    }
+
+    /** @test */
+    public function rejectShouldForwardReasonWhenCallbackIsNull()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever()
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function rejectShouldMakePromiseImmutable()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then(null, function ($value) use ($adapter) {
+                $adapter->reject(3);
+
+                return Promise\reject($value);
+            })
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        $adapter->reject(1);
+        $adapter->reject(2);
+    }
+
+    /** @test */
+    public function notifyShouldInvokeOtherwiseHandler()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->otherwise($mock);
+
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldInvokeRejectionHandler()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $this->assertNull($adapter->promise()->done(null, $mock));
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowExceptionThrownByRejectionHandler()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done(null, function () {
+            throw new \Exception('UnhandledRejectionException');
+        }));
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenRejectedWithNonException()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done());
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenRejectionHandlerRejects()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done(null, function () {
+            return \React\Promise\reject();
+        }));
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowRejectionExceptionWhenRejectionHandlerRejectsWithException()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done(null, function () {
+            return \React\Promise\reject(new \Exception('UnhandledRejectionException'));
+        }));
+        $adapter->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenRejectionHandlerRetunsPendingPromiseWhichRejectsLater()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $d = new Deferred();
+        $promise = $d->promise();
+
+        $this->assertNull($adapter->promise()->done(null, function () use ($promise) {
+            return $promise;
+        }));
+        $adapter->reject(1);
+        $d->reject(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowExceptionProvidedAsRejectionValue()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done());
+        $adapter->reject(new \Exception('UnhandledRejectionException'));
+    }
+
+    /** @test */
+    public function doneShouldThrowWithDeepNestingPromiseChains()
+    {
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $exception = new \Exception('UnhandledRejectionException');
+
+        $d = new Deferred();
+
+        $result = \React\Promise\resolve(\React\Promise\resolve($d->promise()->then(function () use ($exception) {
+            $d = new Deferred();
+            $d->resolve();
+
+            return \React\Promise\resolve($d->promise()->then(function () {}))->then(
+                function () use ($exception) {
+                    throw $exception;
+                }
+            );
+        })));
+
+        $result->done();
+
+        $d->resolve();
+    }
+
+    /** @test */
+    public function doneShouldRecoverWhenRejectionHandlerCatchesException()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->assertNull($adapter->promise()->done(null, function (\Exception $e) {
+
+        }));
+        $adapter->reject(new \Exception('UnhandledRejectionException'));
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressRejection()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () {})
+            ->then(null, $mock);
+
+        $adapter->reject($exception);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressRejectionWhenHandlerReturnsANonPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () {
+                return 1;
+            })
+            ->then(null, $mock);
+
+        $adapter->reject($exception);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressRejectionWhenHandlerReturnsAPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () {
+                return \React\Promise\resolve(1);
+            })
+            ->then(null, $mock);
+
+        $adapter->reject($exception);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerThrowsForRejection()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () use ($exception) {
+                throw $exception;
+            })
+            ->then(null, $mock);
+
+        $adapter->reject($exception);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerRejectsForRejection()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () use ($exception) {
+                return \React\Promise\reject($exception);
+            })
+            ->then(null, $mock);
+
+        $adapter->reject($exception);
+    }
+}

vendor/react/promise/tests/PromiseTest/ResolveTestTrait.php

@@ -0,0 +1,312 @@
+<?php
+
+namespace React\Promise\PromiseTest;
+
+use React\Promise;
+
+trait ResolveTestTrait
+{
+    /**
+     * @return \React\Promise\PromiseAdapter\PromiseAdapterInterface
+     */
+    abstract public function getPromiseTestAdapter(callable $canceller = null);
+
+    /** @test */
+    public function resolveShouldResolve()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($mock);
+
+        $adapter->resolve(1);
+    }
+
+    /** @test */
+    public function resolveShouldResolveWithPromisedValue()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($mock);
+
+        $adapter->resolve(Promise\resolve(1));
+    }
+
+    /** @test */
+    public function resolveShouldRejectWhenResolvedWithRejectedPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then($this->expectCallableNever(), $mock);
+
+        $adapter->resolve(Promise\reject(1));
+    }
+
+    /** @test */
+    public function resolveShouldForwardValueWhenCallbackIsNull()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then(
+                null,
+                $this->expectCallableNever()
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+
+        $adapter->resolve(1);
+    }
+
+    /** @test */
+    public function resolveShouldMakePromiseImmutable()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $adapter->promise()
+            ->then(function ($value) use ($adapter) {
+                $adapter->resolve(3);
+
+                return $value;
+            })
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+
+        $adapter->resolve(1);
+        $adapter->resolve(2);
+    }
+
+    /**
+     * @test
+     */
+    public function resolveShouldRejectWhenResolvedWithItself()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with(new \LogicException('Cannot resolve a promise with itself.'));
+
+        $adapter->promise()
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        $adapter->resolve($adapter->promise());
+    }
+
+    /**
+     * @test
+     */
+    public function resolveShouldRejectWhenResolvedWithAPromiseWhichFollowsItself()
+    {
+        $adapter1 = $this->getPromiseTestAdapter();
+        $adapter2 = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with(new \LogicException('Cannot resolve a promise with itself.'));
+
+        $promise1 = $adapter1->promise();
+
+        $promise2 = $adapter2->promise();
+
+        $promise2->then(
+            $this->expectCallableNever(),
+            $mock
+        );
+
+        $adapter1->resolve($promise2);
+        $adapter2->resolve($promise1);
+    }
+
+    /** @test */
+    public function doneShouldInvokeFulfillmentHandler()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $this->assertNull($adapter->promise()->done($mock));
+        $adapter->resolve(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowExceptionThrownFulfillmentHandler()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('\Exception', 'UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done(function () {
+            throw new \Exception('UnhandledRejectionException');
+        }));
+        $adapter->resolve(1);
+    }
+
+    /** @test */
+    public function doneShouldThrowUnhandledRejectionExceptionWhenFulfillmentHandlerRejects()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $this->setExpectedException('React\\Promise\\UnhandledRejectionException');
+
+        $this->assertNull($adapter->promise()->done(function () {
+            return \React\Promise\reject();
+        }));
+        $adapter->resolve(1);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressValue()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $value = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($value));
+
+        $adapter->promise()
+            ->always(function () {})
+            ->then($mock);
+
+        $adapter->resolve($value);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressValueWhenHandlerReturnsANonPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $value = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($value));
+
+        $adapter->promise()
+            ->always(function () {
+                return 1;
+            })
+            ->then($mock);
+
+        $adapter->resolve($value);
+    }
+
+    /** @test */
+    public function alwaysShouldNotSuppressValueWhenHandlerReturnsAPromise()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $value = new \stdClass();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($value));
+
+        $adapter->promise()
+            ->always(function () {
+                return \React\Promise\resolve(1);
+            })
+            ->then($mock);
+
+        $adapter->resolve($value);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerThrowsForFulfillment()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () use ($exception) {
+                throw $exception;
+            })
+            ->then(null, $mock);
+
+        $adapter->resolve(1);
+    }
+
+    /** @test */
+    public function alwaysShouldRejectWhenHandlerRejectsForFulfillment()
+    {
+        $adapter = $this->getPromiseTestAdapter();
+
+        $exception = new \Exception();
+
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo($exception));
+
+        $adapter->promise()
+            ->always(function () use ($exception) {
+                return \React\Promise\reject($exception);
+            })
+            ->then(null, $mock);
+
+        $adapter->resolve(1);
+    }
+}

vendor/react/promise/tests/RejectedPromiseTest.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace React\Promise;
+
+use React\Promise\PromiseAdapter\CallbackPromiseAdapter;
+
+class RejectedPromiseTest extends TestCase
+{
+    use PromiseTest\PromiseSettledTestTrait,
+        PromiseTest\PromiseRejectedTestTrait;
+
+    public function getPromiseTestAdapter(callable $canceller = null)
+    {
+        $promise = null;
+
+        return new CallbackPromiseAdapter([
+            'promise' => function () use (&$promise) {
+                if (!$promise) {
+                    throw new \LogicException('RejectedPromise must be rejected before obtaining the promise');
+                }
+
+                return $promise;
+            },
+            'resolve' => function () {
+                throw new \LogicException('You cannot call resolve() for React\Promise\RejectedPromise');
+            },
+            'reject' => function ($reason = null) use (&$promise) {
+                if (!$promise) {
+                    $promise = new RejectedPromise($reason);
+                }
+            },
+            'notify' => function () {
+                // no-op
+            },
+            'settle' => function ($reason = null) use (&$promise) {
+                if (!$promise) {
+                    $promise = new RejectedPromise($reason);
+                }
+            },
+        ]);
+    }
+
+    /** @test */
+    public function shouldThrowExceptionIfConstructedWithAPromise()
+    {
+        $this->setExpectedException('\InvalidArgumentException');
+
+        return new RejectedPromise(new RejectedPromise());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToRejectedPromiseWithAlwaysFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new RejectedPromise(1);
+        $promise->always(function () {
+            throw new \RuntimeException();
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+
+    /** @test */
+    public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToRejectedPromiseWithThenFollowers()
+    {
+        gc_collect_cycles();
+        $promise = new RejectedPromise(1);
+        $promise = $promise->then(null, function () {
+            throw new \RuntimeException();
+        });
+        unset($promise);
+
+        $this->assertSame(0, gc_collect_cycles());
+    }
+}

vendor/react/promise/tests/TestCase.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace React\Promise;
+
+class TestCase extends \PHPUnit\Framework\TestCase
+{
+    public function expectCallableExactly($amount)
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->exactly($amount))
+            ->method('__invoke');
+
+        return $mock;
+    }
+
+    public function expectCallableOnce()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke');
+
+        return $mock;
+    }
+
+    public function expectCallableNever()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->never())
+            ->method('__invoke');
+
+        return $mock;
+    }
+
+    public function createCallableMock()
+    {
+        return $this->getMockBuilder('stdClass')->setMethods(array('__invoke'))->getMock();
+    }
+
+    public function setExpectedException($exception, $exceptionMessage = '', $exceptionCode = null)
+    {
+        if (method_exists($this, 'expectException')) {
+            // PHPUnit 5+
+            $this->expectException($exception);
+            if ($exceptionMessage !== '') {
+                $this->expectExceptionMessage($exceptionMessage);
+            }
+            if ($exceptionCode !== null) {
+                $this->expectExceptionCode($exceptionCode);
+            }
+        } else {
+            // legacy PHPUnit 4
+            parent::setExpectedException($exception, $exceptionMessage, $exceptionCode);
+        }
+    }
+}

vendor/react/promise/tests/fixtures/SimpleFulfilledTestPromise.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace React\Promise;
+
+class SimpleFulfilledTestPromise implements PromiseInterface
+{
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        try {
+            if ($onFulfilled) {
+                $onFulfilled('foo');
+            }
+
+            return new self();
+        } catch (\Throwable $exception) {
+            return new RejectedPromise($exception);
+        } catch (\Exception $exception) {
+            return new RejectedPromise($exception);
+        }
+    }
+}

vendor/react/promise/tests/fixtures/SimpleFulfilledTestThenable.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace React\Promise;
+
+class SimpleFulfilledTestThenable
+{
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        try {
+            if ($onFulfilled) {
+                $onFulfilled('foo');
+            }
+
+            return new self();
+        } catch (\Throwable $exception) {
+            return new RejectedPromise($exception);
+        } catch (\Exception $exception) {
+            return new RejectedPromise($exception);
+        }
+    }
+}

vendor/react/promise/tests/fixtures/SimpleRejectedTestPromise.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace React\Promise;
+
+class SimpleRejectedTestPromise implements PromiseInterface
+{
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        try {
+            if ($onRejected) {
+                $onRejected('foo');
+            }
+
+            return new self();
+        } catch (\Throwable $exception) {
+            return new RejectedPromise($exception);
+        } catch (\Exception $exception) {
+            return new RejectedPromise($exception);
+        }
+    }
+}

vendor/react/promise/tests/fixtures/SimpleTestCancellable.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace React\Promise;
+
+class SimpleTestCancellable
+{
+    public $cancelCalled = false;
+
+    public function cancel()
+    {
+        $this->cancelCalled = true;
+    }
+}

vendor/react/promise/tests/fixtures/SimpleTestCancellableThenable.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace React\Promise;
+
+class SimpleTestCancellableThenable
+{
+    public $cancelCalled = false;
+
+    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
+    {
+        return new self();
+    }
+
+    public function cancel()
+    {
+        $this->cancelCalled = true;
+    }
+}