add

vendor/symfony/http-foundation/Test/Constraint/ResponseFormatSame.php

@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Test\Constraint;
+
+use PHPUnit\Framework\Constraint\Constraint;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Asserts that the response is in the given format.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+final class ResponseFormatSame extends Constraint
+{
+    private $request;
+    private $format;
+
+    public function __construct(Request $request, ?string $format)
+    {
+        $this->request = $request;
+        $this->format = $format;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toString(): string
+    {
+        return 'format is '.($this->format ?? 'null');
+    }
+
+    /**
+     * @param Response $response
+     *
+     * {@inheritdoc}
+     */
+    protected function matches($response): bool
+    {
+        return $this->format === $this->request->getFormat($response->headers->get('Content-Type'));
+    }
+
+    /**
+     * @param Response $response
+     *
+     * {@inheritdoc}
+     */
+    protected function failureDescription($response): string
+    {
+        return 'the Response '.$this->toString();
+    }
+
+    /**
+     * @param Response $response
+     *
+     * {@inheritdoc}
+     */
+    protected function additionalFailureDescription($response): string
+    {
+        return (string) $response;
+    }
+}