yetangitu/bitjs
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Code Issues Releases Wiki Activity

For Issue #27, rewrite most tests to use mocha/chai via npm run test

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Jeff Schiller 2021-06-02 23:26:58 -07:00
parent 83442ea837
commit f195434de5
12 changed files with 1149 additions and 352 deletions
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node_modules

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README.md
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@ -9,7 +9,6 @@ A set of dependency-free JavaScript modules to handle binary data in JS (using T
* bitjs/image: Conversion of WebP images to PNG or JPEG. * bitjs/image: Conversion of WebP images to PNG or JPEG.
* bitjs/io: Low-level classes for interpreting binary data (BitStream, ByteStream). For example, reading or peeking at N bits at a time. * bitjs/io: Low-level classes for interpreting binary data (BitStream, ByteStream). For example, reading or peeking at N bits at a time.
## Installation ## Installation
Install it using your favourite package manager, the package is registered under `@codedread/bitjs`. Install it using your favourite package manager, the package is registered under `@codedread/bitjs`.
@ -102,11 +101,11 @@ const crc = bstream.readBits(12); // read in 12 bits as CRC, advancing the point
const flagbits = bstream.peekBits(6); // look ahead at next 6 bits, but do not advance the pointer const flagbits = bstream.peekBits(6); // look ahead at next 6 bits, but do not advance the pointer
``` ```
## Tests ## Other Tests
Those that haven't been ported to mocha/chai/nodejs.
* [bitjs.archive tests](https://codedread.github.io/bitjs/tests/archive-test.html) * [bitjs.archive tests](https://codedread.github.io/bitjs/tests/archive-test.html)
* [bitjs.file tests](https://codedread.github.io/bitjs/tests/file-sniifer-test.html)
* [bitjs.io tests](https://codedread.github.io/bitjs/tests/io-test.html)
## Reference ## Reference

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} }

6
package.json
View file

@ -32,6 +32,10 @@
"test": "tests" "test": "tests"
}, },
"scripts": { "scripts": {
"test": "echo \"Error: no test specified\" && exit 1" "test": "./node_modules/.bin/mocha tests/*.spec.js"
},
"devDependencies": {
"chai": "^4.3.4",
"mocha": "^8.4.0"
} }
} }

39
tests/file-sniffer-test.html
View file

@ -1,39 +0,0 @@
<!DOCTYPE html>
<html>
<head>
<title>Unit tests for bitjs.io.ByteStreamBitStream</title>
</head>
<body>
<script type="module">
import { findMimeType } from '../file/sniffer.js';
import { assertEquals, runTests } from './muther.js';
function sniffTest(mimeType, sig) {
const array = new Uint8Array(16);
array.set(sig);
assertEquals(mimeType, findMimeType(array.buffer));
}
runTests({
setUp: function() {},
tests: {
testBMP() { sniffTest('image/bmp', [0x42, 0x4D, 0x46]); },
testGIF() { sniffTest('image/gif', [0x47, 0x49, 0x46, 0x38, 0x20]); },
testJPG() { sniffTest('image/jpeg', [0xFF, 0xD8, 0xFF, 0x23]); },
testPNG() { sniffTest('image/png', [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0xFF]); },
testWebP() { sniffTest('image/webp', [0x52, 0x49, 0x46, 0x46, 0x01, 0x02, 0x03, 0x04, 0x57, 0x45, 0x42, 0x50, 0x81]); },
testZIP() { sniffTest('application/zip', [0x50, 0x4B, 0x03, 0x04, 0x20]); },
testZIP_empty() { sniffTest('application/zip', [0x50, 0x4B, 0x05, 0x06, 0x20]); },
testZIP_spanned() { sniffTest('application/zip', [0x50, 0x4B, 0x07, 0x08, 0x20]); },
test7Z() { sniffTest('application/x-7z-compressed', [0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C, 0x2B]); },
testRAR() { sniffTest('application/x-rar-compressed', [0x52, 0x61, 0x72, 0x21, 0x1A, 0x07, 0x23]); },
testBZ2() { sniffTest('application/x-bzip2', [0x42, 0x5A, 0x68, 0x19]); },
testPDF() { sniffTest('application/pdf', [0x25, 0x50, 0x44, 0x46, 0x2d, 0x55]); },
testMP3_1() { sniffTest('audio/mpeg', [0xFF, 0xFB]); },
testMP3_2() { sniffTest('audio/mpeg', [0xFF, 0xF3]); },
testMP3_3() { sniffTest('audio/mpeg', [0xFF, 0xF2]); },
testMP3_4() { sniffTest('audio/mpeg', [0x49, 0x44, 0x33]); },
testOGG() { sniffTest('application/ogg', [0x4F, 0x67, 0x67, 0x53]); },
},
});
</script>

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/*
* archive-test.js
*
* Licensed under the MIT License
*
* Copyright(c) 2021 Google Inc.
*/
import { findMimeType } from '../file/sniffer.js';
import 'mocha';
import { expect } from 'chai';
function sniffTest(mimeType, sig) {
const array = new Uint8Array(16);
array.set(sig);
expect(findMimeType(array.buffer)).equals(mimeType);
}
describe('bitjs.file.sniffer', () => {
it('BMP', () => { sniffTest('image/bmp', [0x42, 0x4D, 0x46]); });
it('GIF', () => { sniffTest('image/gif', [0x47, 0x49, 0x46, 0x38, 0x20]); });
it('JPG', () => { sniffTest('image/jpeg', [0xFF, 0xD8, 0xFF, 0x23]); });
it('PNG', () => { sniffTest('image/png', [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0xFF]); });
it('WebP', () => { sniffTest('image/webp', [0x52, 0x49, 0x46, 0x46, 0x01, 0x02, 0x03, 0x04, 0x57, 0x45, 0x42, 0x50, 0x81]); });
it('ZIP', () => { sniffTest('application/zip', [0x50, 0x4B, 0x03, 0x04, 0x20]); });
it('ZIP_empty', () => { sniffTest('application/zip', [0x50, 0x4B, 0x05, 0x06, 0x20]); });
it('ZIP_spanned', () => { sniffTest('application/zip', [0x50, 0x4B, 0x07, 0x08, 0x20]); });
it('7Z()', () => { sniffTest('application/x-7z-compressed', [0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C, 0x2B]); });
it('RAR()', () => { sniffTest('application/x-rar-compressed', [0x52, 0x61, 0x72, 0x21, 0x1A, 0x07, 0x23]); });
it('BZ2()', () => { sniffTest('application/x-bzip2', [0x42, 0x5A, 0x68, 0x19]); });
it('PDF()', () => { sniffTest('application/pdf', [0x25, 0x50, 0x44, 0x46, 0x2d, 0x55]); });
it('MP3_1()', () => { sniffTest('audio/mpeg', [0xFF, 0xFB]); });
it('MP3_2()', () => { sniffTest('audio/mpeg', [0xFF, 0xF3]); });
it('MP3_3()', () => { sniffTest('audio/mpeg', [0xFF, 0xF2]); });
it('MP3_4()', () => { sniffTest('audio/mpeg', [0x49, 0x44, 0x33]); });
it('OGG', () => { sniffTest('application/ogg', [0x4F, 0x67, 0x67, 0x53]); });
});

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<!DOCTYPE html>
<html>
<head>
<title>Unit tests for bitjs.io.BitStream</title>
</head>
<body>
<script type="module">
import { BitStream } from '../io/bitstream.js';
import { assert, assertEquals, assertThrows, runTests } from './muther.js';
let array;
runTests({
setUp: function() {
array = new Uint8Array(4);
for (let i = 0; i < 4; ++i) {
array[i] = Number('0b01100101');
}
},
tests: {
testBitPeekAndRead_RTL() {
const stream = new BitStream(array.buffer, true /* rtl */);
// 0110 = 2 + 4 = 6
assertEquals(6, stream.readBits(4));
// 0101 011 = 1 + 2 + 8 + 32 = 43
assertEquals(43, stream.readBits(7));
// 00101 01100101 01 = 1 + 4 + 16 + 128 + 256 + 1024 + 4096 = 5525
assertEquals(5525, stream.readBits(15));
// 10010 = 2 + 16 = 18
assertEquals(18, stream.readBits(5));
// Ensure the last bit is read, even if we flow past the end of the stream.
assertEquals(1, stream.readBits(2));
},
testBitPeekAndRead_LTR() {
const stream = new BitStream(array.buffer, false /* rtl */);
// 0101 = 2 + 4 = 6
assertEquals(5, stream.peekBits(4));
assertEquals(5, stream.readBits(4));
// 101 0110 = 2 + 4 + 16 + 64 = 86
assertEquals(86, stream.readBits(7));
// 01 01100101 01100 = 4 + 8 + 32 + 128 + 1024 + 2048 + 8192 = 11436
assertEquals(11436, stream.readBits(15));
// 11001 = 1 + 8 + 16 = 25
assertEquals(25, stream.readBits(5));
// Only 1 bit left in the buffer, make sure it reads in, even if we over-read.
assertEquals(0, stream.readBits(2));
},
testBitStreamReadBytes() {
array[1] = Number('0b01010110');
const stream = new BitStream(array.buffer);
let twoBytes = stream.peekBytes(2);
assert(twoBytes instanceof Uint8Array);
assertEquals(2, twoBytes.byteLength);
assertEquals(Number('0b01100101'), twoBytes[0]);
assertEquals(Number('0b01010110'), twoBytes[1]);
twoBytes = stream.readBytes(2);
assert(twoBytes instanceof Uint8Array);
assertEquals(2, twoBytes.byteLength);
assertEquals(Number('0b01100101'), twoBytes[0]);
assertEquals(Number('0b01010110'), twoBytes[1]);
assertThrows(() => stream.readBytes(3),
'Did not throw when trying to read bytes past the end of the stream');
},
},
});
</script>
</body>
</html>

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/*
* archive-test.js
*
* Licensed under the MIT License
*
* Copyright(c) 2021 Google Inc.
*/
import { BitStream } from '../io/bitstream.js';
import 'mocha';
import { expect } from 'chai';
describe('bitjs.io.BitStream', () => {
let array;
beforeEach(() => {
array = new Uint8Array(4);
for (let i = 0; i < 4; ++i) {
array[i] = Number('0b01100101');
}
});
it('BitPeekAndRead_RTL', () => {
const stream = new BitStream(array.buffer, true /* rtl */);
// 0110 = 2 + 4 = 6
expect(stream.readBits(4)).equals(6);
// 0101 011 = 1 + 2 + 8 + 32 = 43
expect(stream.readBits(7)).equals(43);
// 00101 01100101 01 = 1 + 4 + 16 + 128 + 256 + 1024 + 4096 = 5525
expect(stream.readBits(15)).equals(5525);
// 10010 = 2 + 16 = 18
expect(stream.readBits(5)).equals(18);
// Ensure the last bit is read, even if we flow past the end of the stream.
expect(stream.readBits(2)).equals(1);
});
it('BitPeekAndRead_LTR', () => {
const stream = new BitStream(array.buffer, false /* rtl */);
// 0101 = 2 + 4 = 6
expect(stream.peekBits(4)).equals(5);
expect(stream.readBits(4)).equals(5);
// 101 0110 = 2 + 4 + 16 + 64 = 86
expect(stream.readBits(7)).equals(86);
// 01 01100101 01100 = 4 + 8 + 32 + 128 + 1024 + 2048 + 8192 = 11436
expect(stream.readBits(15)).equals(11436);
// 11001 = 1 + 8 + 16 = 25
expect(stream.readBits(5)).equals(25);
// Only 1 bit left in the buffer, make sure it reads in, even if we over-read.
expect(stream.readBits(2)).equals(0);
});
it('BitStreamReadBytes', () => {
array[1] = Number('0b01010110');
const stream = new BitStream(array.buffer);
let twoBytes = stream.peekBytes(2);
expect(twoBytes instanceof Uint8Array).true;
expect(twoBytes.byteLength).equals(2);
expect(twoBytes[0]).equals(Number('0b01100101'));
expect(twoBytes[1]).equals(Number('0b01010110'));
twoBytes = stream.readBytes(2);
expect(twoBytes instanceof Uint8Array).true;
expect(twoBytes.byteLength).equals(2);
expect(twoBytes[0]).equals(Number('0b01100101'));
expect(twoBytes[1]).equals(Number('0b01010110'));
expect(() => stream.readBytes(3)).throws();
});
});

58
tests/io-bytebuffer-test.html
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<!DOCTYPE html>
<html>
<head>
<title>Unit tests for bitjs.io.ByteBufferBitStream</title>
</head>
<body>
<script type="module">
import { ByteBuffer } from '../io/bytebuffer.js';
import { ByteStream } from '../io/bytestream.js';
import { assertEquals, assertThrows, runTests } from './muther.js';
// TODO: Only test ByteBuffer here.
let buffer;
runTests({
setUp: function() {
buffer = new ByteBuffer(4);
},
tests: {
testWrite_SingleByte() {
buffer.writeNumber(192, 1);
assertEquals(1, buffer.ptr);
},
testWrite_SingleByteNegativeNumber() {
buffer.writeSignedNumber(-120, 1);
assertEquals(1, buffer.ptr);
},
testWrite_MultiByteNumber() {
buffer.writeNumber(1234, 4);
const stream = new ByteStream(buffer.data.buffer);
assertEquals(4, buffer.ptr);
},
testWrite_MultiByteNegativeNumber() {
buffer.writeSignedNumber(-1234, 4);
assertEquals(4, buffer.ptr);
},
testWriteOverflowUnsigned() {
assertThrows(() => buffer.writeNumber(256, 1),
'Did not throw when trying to write a number into too-few bytes');
},
testWriteOverflowSignedPositive() {
assertThrows(() => buffer.writeSignedNumber(128, 1),
'Did not throw when trying to write a signed number into too-few bytes');
},
testWriteOverflowSignedNegative() {
assertThrows(() => buffer.writeSignedNumber(-129, 1),
'Did not throw when trying to write a negative signed number into too-few bytes');
},
},
});
</script>
</body>
</html>

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/*
* archive-test.js
*
* Licensed under the MIT License
*
* Copyright(c) 2021 Google Inc.
*/
import { ByteBuffer } from '../io/bytebuffer.js';
import { ByteStream } from '../io/bytestream.js';
import 'mocha';
import { expect } from 'chai';
// TODO: Only test ByteBuffer here.
describe('bitjs.io.ByteBufferBitStream', () => {
let buffer;
beforeEach(() => {
buffer = new ByteBuffer(4);
});
it('Write_SingleByte', () => {
buffer.writeNumber(192, 1);
expect(buffer.ptr).equals(1);
});
it('Write_SingleByteNegativeNumber', () => {
buffer.writeSignedNumber(-120, 1);
expect(buffer.ptr).equals(1);
});
it('Write_MultiByteNumber', () => {
buffer.writeNumber(1234, 4);
const stream = new ByteStream(buffer.data.buffer);
expect(buffer.ptr).equals(4);
});
it('Write_MultiByteNegativeNumber', () => {
buffer.writeSignedNumber(-1234, 4);
expect(buffer.ptr).equals(4);
});
it('WriteOverflowUnsigned', () => {
expect(() => buffer.writeNumber(256, 1)).throws();
});
it('WriteOverflowSignedPositive', () => {
expect(() => buffer.writeSignedNumber(128, 1)).throws();
});
it('WriteOverflowSignedNegative', () => {
expect(() => buffer.writeSignedNumber(-129, 1)).throws();
});
});

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<!DOCTYPE html>
<html>
<head>
<title>Unit tests for bitjs.io.ByteStreamBitStream</title>
<script src="muther.js"></script>
</head>
<body>
<script type="module">
import { ByteStream } from '../io/bytestream.js';
import { assertEquals, assertThrows, runTests } from './muther.js';
let array;
runTests({
setUp: function() {
array = new Uint8Array(4);
},
tests: {
testPeekAndRead_SingleByte() {
array[0] = 192;
const stream = new ByteStream(array.buffer);
assertEquals(192, stream.peekNumber(1));
assertEquals(192, stream.readNumber(1));
},
testPeekAndRead_MultiByteNumber() {
array[0] = (1234 & 0xff);
array[1] = ((1234 >> 8) & 0xff);
const stream = new ByteStream(array.buffer);
assertEquals(1234, stream.peekNumber(4));
assertEquals(1234, stream.readNumber(4));
assertThrows(() => stream.readNumber(1),
'Did not throw when trying to readNumber past end of stream');
},
testPeekAndRead_SingleByteSignedNumber() {
array[0] = -120;
const stream = new ByteStream(array.buffer);
assertEquals(-120, stream.peekSignedNumber(1));
assertEquals(-120, stream.readSignedNumber(1));
},
testPeekAndRead_SingleByteNegativeNumber() {
array[0] = -128;
const stream = new ByteStream(array.buffer);
assertEquals(-128, stream.peekSignedNumber(1));
assertEquals(-128, stream.readSignedNumber(1));
},
testPeekAndRead_MultiByteSignedNumber() {
array[0] = (1234 & 0xff);
array[1] = ((1234 >> 8) & 0xff);
const stream = new ByteStream(array.buffer);
assertEquals(1234, stream.peekSignedNumber(2));
assertEquals(1234, stream.readSignedNumber(2));
},
testPeekAndRead_MultiByteNegativeNumber() {
array[0] = (-1234 & 0xff);
array[1] = ((-1234 >> 8) & 0xff);
const stream = new ByteStream(array.buffer);
assertEquals(-1234, stream.peekSignedNumber(2));
assertEquals(-1234, stream.readSignedNumber(2));
},
testByteStreamReadBytesPastEnd() {
const stream = new ByteStream(array.buffer);
assertThrows(() => stream.readBytes(5),
'Did not throw when trying to readBytes past end of stream');
},
testReadStringPastEnd() {
const stream = new ByteStream(array.buffer);
assertThrows(() => stream.readString(5),
'Did not throw when trying to readString past end of stream');
},
testPushThenReadNumber() {
array = new Uint8Array(1);
array[0] = (1234 & 0xff);
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(1);
anotherArray[0] = ((1234 >> 8) & 0xff);
stream.push(anotherArray.buffer);
assertEquals(1234, stream.readNumber(2), 'Could not read number across pages');
},
testReadBytesThenPushThenReadByte() {
for (let i = 0; i < 4; ++i) array[i] = i;
const stream = new ByteStream(array.buffer);
const bytes = stream.readBytes(4);
assertThrows(() => stream.readBytes(1),
'Did not throw when trying to readBytes past end of stream');
const anotherArray = new Uint8Array(1);
anotherArray[0] = 4;
stream.push(anotherArray.buffer);
assertEquals(4, stream.readNumber(1), 'Could not read in byte after pushing');
},
testPushThenReadBytesAcrossOnePage() {
for (let i = 0; i < 4; ++i) array[i] = i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(1);
anotherArray[0] = 4;
stream.push(anotherArray.buffer);
const bytes = stream.readBytes(5);
assertEquals(5, bytes.length, 'Could not read bytes across pages');
for (let i = 0; i < 5; ++i) {
assertEquals(i, bytes[i], 'Byte ' + i + ' not right');
}
},
testPushThenReadBytesAcrossMultiplePages() {
for (let i = 0; i < 4; ++i) array[i] = i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) anotherArray[i] = i + 4;
const yetAnotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) yetAnotherArray[i] = i + 8;
stream.push(anotherArray.buffer);
stream.push(yetAnotherArray.buffer);
const bytes = stream.readBytes(12);
assertEquals(12, bytes.length, 'Could not read bytes across multiple pages');
for (let i = 0; i < 12; ++i) {
assertEquals(i, bytes[i], 'Byte ' + i + ' not right');
}
},
testPushThenReadStringAcrossMultiplePages() {
for (let i = 0; i < 4; ++i) array[i] = 65 + i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) anotherArray[i] = 69 + i;
const yetAnotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) yetAnotherArray[i] = 73 + i;
stream.push(anotherArray.buffer);
stream.push(yetAnotherArray.buffer);
const str = stream.readString(12);
assertEquals('ABCDEFGHIJKL', str, 'String was ' + str);
},
testTee() {
for (let i = 0; i < 4; ++i) array[i] = 65 + i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) anotherArray[i] = 69 + i;
stream.push(anotherArray.buffer);
const teed = stream.tee();
teed.readBytes(5);
assertEquals(8, stream.getNumBytesLeft());
assertEquals(3, teed.getNumBytesLeft());
},
},
});
</script>
</body>
</html>

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/*
* archive-test.js
*
* Licensed under the MIT License
*
* Copyright(c) 2021 Google Inc.
*/
import { ByteStream } from '../io/bytestream.js';
import 'mocha';
import { expect } from 'chai';
describe('bitjs.io.ByteStream', () => {
let array;
beforeEach(() => {
array = new Uint8Array(4);
});
it('PeekAndRead_SingleByte', () => {
array[0] = 192;
const stream = new ByteStream(array.buffer);
expect(stream.peekNumber(1)).equals(192);
expect(stream.readNumber(1)).equals(192);
});
it('PeekAndRead_MultiByteNumber', () => {
array[0] = (1234 & 0xff);
array[1] = ((1234 >> 8) & 0xff);
const stream = new ByteStream(array.buffer);
expect(stream.peekNumber(4)).equals(1234);
expect(stream.readNumber(4)).equals(1234);
expect(() => stream.readNumber(1)).to.throw();
});
it('PeekAndRead_SingleByteSignedNumber', () => {
array[0] = -120;
const stream = new ByteStream(array.buffer);
expect(stream.peekSignedNumber(1)).equals(-120);
expect(stream.readSignedNumber(1)).equals(-120);
});
it('PeekAndRead_SingleByteNegativeNumber', () => {
array[0] = -128;
const stream = new ByteStream(array.buffer);
expect(stream.peekSignedNumber(1)).equals(-128);
expect(stream.readSignedNumber(1)).equals(-128);
});
it('PeekAndRead_MultiByteSignedNumber', () => {
array[0] = (1234 & 0xff);
array[1] = ((1234 >> 8) & 0xff);
const stream = new ByteStream(array.buffer);
expect(stream.peekSignedNumber(2)).equals(1234);
expect(stream.peekSignedNumber(2)).equals(1234);
});
it('PeekAndRead_MultiByteNegativeNumber', () => {
array[0] = (-1234 & 0xff);
array[1] = ((-1234 >> 8) & 0xff);
const stream = new ByteStream(array.buffer);
expect(stream.peekSignedNumber(2)).equals(-1234);
expect(stream.peekSignedNumber(2)).equals(-1234);
});
it('ByteStreamReadBytesPastEnd', () => {
const stream = new ByteStream(array.buffer);
expect(() => stream.readBytes(5)).to.throw();
});
it('ReadStringPastEnd', () => {
const stream = new ByteStream(array.buffer);
expect(() => stream.readString(5)).to.throw();
});
it('PushThenReadNumber', () => {
array = new Uint8Array(1);
array[0] = (1234 & 0xff);
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(1);
anotherArray[0] = ((1234 >> 8) & 0xff);
stream.push(anotherArray.buffer);
expect(stream.readNumber(2)).equals(1234);
});
it('ReadBytesThenPushThenReadByte', () => {
for (let i = 0; i < 4; ++i) array[i] = i;
const stream = new ByteStream(array.buffer);
const bytes = stream.readBytes(4);
expect(() => stream.readBytes(1)).to.throw();
const anotherArray = new Uint8Array(1);
anotherArray[0] = 4;
stream.push(anotherArray.buffer);
expect(stream.readNumber(1), 'Could not read in byte after pushing').equals(4);
});
it('PushThenReadBytesAcrossOnePage', () => {
for (let i = 0; i < 4; ++i) array[i] = i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(1);
anotherArray[0] = 4;
stream.push(anotherArray.buffer);
const bytes = stream.readBytes(5);
expect(bytes.length).equals(5);
for (let i = 0; i < 5; ++i) {
expect(bytes[i]).equals(i);
}
});
it('PushThenReadBytesAcrossMultiplePages', () => {
for (let i = 0; i < 4; ++i) array[i] = i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) anotherArray[i] = i + 4;
const yetAnotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) yetAnotherArray[i] = i + 8;
stream.push(anotherArray.buffer);
stream.push(yetAnotherArray.buffer);
const bytes = stream.readBytes(12);
expect(bytes.length).equals(12);
for (let i = 0; i < 12; ++i) {
expect(bytes[i]).equals(i);
}
});
it('PushThenReadStringAcrossMultiplePages', () => {
for (let i = 0; i < 4; ++i) array[i] = 65 + i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) anotherArray[i] = 69 + i;
const yetAnotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) yetAnotherArray[i] = 73 + i;
stream.push(anotherArray.buffer);
stream.push(yetAnotherArray.buffer);
const str = stream.readString(12);
expect(str).equals('ABCDEFGHIJKL');
});
it('Tee', () => {
for (let i = 0; i < 4; ++i) array[i] = 65 + i;
const stream = new ByteStream(array.buffer);
const anotherArray = new Uint8Array(4);
for (let i = 0; i < 4; ++i) anotherArray[i] = 69 + i;
stream.push(anotherArray.buffer);
const teed = stream.tee();
teed.readBytes(5);
expect(stream.getNumBytesLeft()).equals(8);
expect(teed.getNumBytesLeft()).equals(3);
});
});