60 lines
2 KiB
JavaScript
60 lines
2 KiB
JavaScript
// META: global=window,worker,shadowrealm
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'use strict';
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const classes = [
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{
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name: 'TextDecoderStream',
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input: new Uint8Array([65])
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},
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{
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name: 'TextEncoderStream',
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input: 'A'
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}
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];
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const microtasksRun = () => new Promise(resolve => step_timeout(resolve, 0));
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for (const streamClass of classes) {
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promise_test(async () => {
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const stream = new self[streamClass.name]();
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const writer = stream.writable.getWriter();
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const reader = stream.readable.getReader();
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const events = [];
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await microtasksRun();
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const writePromise = writer.write(streamClass.input);
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writePromise.then(() => events.push('write'));
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await microtasksRun();
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events.push('paused');
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await reader.read();
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events.push('read');
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await writePromise;
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assert_array_equals(events, ['paused', 'read', 'write'],
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'write should happen after read');
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}, 'write() should not complete until read relieves backpressure for ' +
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`${streamClass.name}`);
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promise_test(async () => {
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const stream = new self[streamClass.name]();
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const writer = stream.writable.getWriter();
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const reader = stream.readable.getReader();
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const events = [];
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await microtasksRun();
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const readPromise1 = reader.read();
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readPromise1.then(() => events.push('read1'));
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const writePromise1 = writer.write(streamClass.input);
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const writePromise2 = writer.write(streamClass.input);
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writePromise1.then(() => events.push('write1'));
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writePromise2.then(() => events.push('write2'));
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await microtasksRun();
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events.push('paused');
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const readPromise2 = reader.read();
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readPromise2.then(() => events.push('read2'));
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await Promise.all([writePromise1, writePromise2,
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readPromise1, readPromise2]);
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assert_array_equals(events, ['read1', 'write1', 'paused', 'read2',
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'write2'],
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'writes should not happen before read2');
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}, 'additional writes should wait for backpressure to be relieved for ' +
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`class ${streamClass.name}`);
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}
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