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ef1f130041
Improve the assert error message so it includes actual value in the error message. PR-URL: https://github.com/nodejs/node/pull/21160 Reviewed-By: Weijia Wang <starkwang@126.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Yuta Hiroto <hello@hiroppy.me> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
'use strict';
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const common = require('../common');
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const stream = require('stream');
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const assert = require('assert');
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// This is very similar to test-stream-pipe-cleanup-pause.js.
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const reader = new stream.Readable();
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const writer1 = new stream.Writable();
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const writer2 = new stream.Writable();
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const writer3 = new stream.Writable();
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// 560000 is chosen here because it is larger than the (default) highWaterMark
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// and will cause `.write()` to return false
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// See: https://github.com/nodejs/node/issues/5820
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const buffer = Buffer.allocUnsafe(560000);
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reader._read = () => {};
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writer1._write = common.mustCall(function(chunk, encoding, cb) {
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this.emit('chunk-received');
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cb();
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}, 1);
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writer1.once('chunk-received', function() {
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assert.strictEqual(
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reader._readableState.awaitDrain,
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0,
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'awaitDrain initial value should be 0, actual is ' +
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reader._readableState.awaitDrain
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);
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setImmediate(function() {
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// This one should *not* get through to writer1 because writer2 is not
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// "done" processing.
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reader.push(buffer);
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});
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});
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// A "slow" consumer:
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writer2._write = common.mustCall(function(chunk, encoding, cb) {
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assert.strictEqual(
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reader._readableState.awaitDrain,
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1,
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'awaitDrain should be 1 after first push, actual is ' +
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reader._readableState.awaitDrain
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);
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// Not calling cb here to "simulate" slow stream.
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// This should be called exactly once, since the first .write() call
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// will return false.
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}, 1);
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writer3._write = common.mustCall(function(chunk, encoding, cb) {
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assert.strictEqual(
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reader._readableState.awaitDrain,
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2,
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'awaitDrain should be 2 after second push, actual is ' +
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reader._readableState.awaitDrain
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);
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// Not calling cb here to "simulate" slow stream.
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// This should be called exactly once, since the first .write() call
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// will return false.
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}, 1);
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reader.pipe(writer1);
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reader.pipe(writer2);
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reader.pipe(writer3);
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reader.push(buffer);
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