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| 1 | +import { describe, it, expect } from 'vitest'; |
| 2 | +import { _TextEncoderStream_polyfill } from './polyfill'; |
| 3 | + |
| 4 | +describe('_TextEncoderStream_polyfill tests', () => { |
| 5 | + it('should encode string to Uint8Array', async () => { |
| 6 | + const encoderStream = new _TextEncoderStream_polyfill(); |
| 7 | + const reader = encoderStream.readable.getReader(); |
| 8 | + |
| 9 | + encoderStream.writable.getWriter().write('hello'); |
| 10 | + const { value, done } = await reader.read(); |
| 11 | + expect(value).toBeInstanceOf(Uint8Array); |
| 12 | + expect(new TextDecoder().decode(value)).toBe('hello'); |
| 13 | + expect(done).toBeFalsy(); |
| 14 | + }); |
| 15 | + |
| 16 | + it('should handle multiple chunks', async () => { |
| 17 | + const encoderStream = new _TextEncoderStream_polyfill(); |
| 18 | + const encoderStream2 = new TextEncoderStream(); |
| 19 | + const writer = encoderStream.writable.getWriter(); |
| 20 | + const reader = encoderStream.readable.getReader(); |
| 21 | + const writer2 = encoderStream2.writable.getWriter(); |
| 22 | + const reader2 = encoderStream2.readable.getReader(); |
| 23 | + |
| 24 | + writer.write('hello'); |
| 25 | + writer.write(' world'); |
| 26 | + writer2.write('hello'); |
| 27 | + writer2.write(' world'); |
| 28 | + |
| 29 | + const results1 = [await reader.read(), await reader.read()]; |
| 30 | + const results2 = [await reader2.read(), await reader2.read()]; |
| 31 | + await writer.close(); |
| 32 | + await writer2.close(); |
| 33 | + |
| 34 | + expect(results1.length).toBe(results2.length); |
| 35 | + expect(new TextDecoder().decode(results1[0].value)).toBe( |
| 36 | + new TextDecoder().decode(results2[0].value) |
| 37 | + ); |
| 38 | + expect(new TextDecoder().decode(results1[1].value)).toBe( |
| 39 | + new TextDecoder().decode(results2[1].value) |
| 40 | + ); |
| 41 | + }); |
| 42 | + |
| 43 | + it('encoding consistency with native TextEncoderStream', async () => { |
| 44 | + const polyfillStream = new _TextEncoderStream_polyfill(); |
| 45 | + const nativeStream = new TextEncoderStream(); |
| 46 | + const testString = 'This is a test string.'; |
| 47 | + |
| 48 | + const polyReader = polyfillStream.readable.getReader(); |
| 49 | + const nativeReader = nativeStream.readable.getReader(); |
| 50 | + |
| 51 | + polyfillStream.writable.getWriter().write(testString); |
| 52 | + nativeStream.writable.getWriter().write(testString); |
| 53 | + |
| 54 | + const polyResult = await polyReader.read(); |
| 55 | + const nativeResult = await nativeReader.read(); |
| 56 | + |
| 57 | + expect(polyResult.value).toEqual(nativeResult.value); |
| 58 | + expect(new TextDecoder().decode(polyResult.value)).toBe(testString); |
| 59 | + }); |
| 60 | + |
| 61 | + it('handles non-string inputs', async () => { |
| 62 | + const polyfillStream = new _TextEncoderStream_polyfill(); |
| 63 | + const nativeStream = new TextEncoderStream(); |
| 64 | + |
| 65 | + const nativeWriter = nativeStream.writable.getWriter(); |
| 66 | + const polyWriter = polyfillStream.writable.getWriter(); |
| 67 | + |
| 68 | + expect(polyWriter.write(123 as any)).toEqual(nativeWriter.write(123 as any)); |
| 69 | + expect(polyWriter.write({} as any)).toEqual(nativeWriter.write({} as any)); |
| 70 | + }); |
| 71 | + |
| 72 | + it('handles large input', async () => { |
| 73 | + const encoderStream = new _TextEncoderStream_polyfill(); |
| 74 | + const writer = encoderStream.writable.getWriter(); |
| 75 | + const reader = encoderStream.readable.getReader(); |
| 76 | + const largeString = 'a'.repeat(10 ** 6); // 1 million characters |
| 77 | + |
| 78 | + writer.write(largeString); |
| 79 | + const { value } = await reader.read(); |
| 80 | + expect(value?.byteLength).toBe(largeString.length); |
| 81 | + }); |
| 82 | + |
| 83 | + it('sequential writes and reads', async () => { |
| 84 | + const encoderStream = new _TextEncoderStream_polyfill(); |
| 85 | + const writer = encoderStream.writable.getWriter(); |
| 86 | + const reader = encoderStream.readable.getReader(); |
| 87 | + |
| 88 | + writer.write('first'); |
| 89 | + writer.write('second'); |
| 90 | + |
| 91 | + const firstResult = await reader.read(); |
| 92 | + const secondResult = await reader.read(); |
| 93 | + |
| 94 | + await writer.close(); |
| 95 | + |
| 96 | + expect(new TextDecoder().decode(firstResult.value)).toBe('first'); |
| 97 | + expect(new TextDecoder().decode(secondResult.value)).toBe('second'); |
| 98 | + }); |
| 99 | + |
| 100 | + it('stream chaining', async () => { |
| 101 | + const encoderStream = new _TextEncoderStream_polyfill(); |
| 102 | + const transformStream = new TransformStream({ |
| 103 | + transform(chunk, controller) { |
| 104 | + controller.enqueue(chunk); |
| 105 | + }, |
| 106 | + }); |
| 107 | + |
| 108 | + const writer = encoderStream.writable.getWriter(); |
| 109 | + const chainedStream = encoderStream.readable.pipeThrough(transformStream); |
| 110 | + const reader = chainedStream.getReader(); |
| 111 | + |
| 112 | + writer.write('test chaining'); |
| 113 | + const result = await reader.read(); |
| 114 | + expect(new TextDecoder().decode(result.value)).toBe('test chaining'); |
| 115 | + }); |
| 116 | +}); |
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