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