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4f2e372716
Export a new common.noop no-operation function for general use. Allow using common.mustCall() without a fn argument to simplify test cases. Replace various non-op functions throughout tests with common.noop PR-URL: https://github.com/nodejs/node/pull/12027 Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com> Reviewed-By: Teddy Katz <teddy.katz@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
97 lines
2.6 KiB
JavaScript
97 lines
2.6 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const Readable = require('stream').Readable;
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const readable = new Readable({
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read: common.noop
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});
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// Initialized to false.
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assert.strictEqual(readable._readableState.needReadable, false);
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readable.on('readable', common.mustCall(() => {
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// When the readable event fires, needReadable is reset.
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assert.strictEqual(readable._readableState.needReadable, false);
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readable.read();
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}));
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// If a readable listener is attached, then a readable event is needed.
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assert.strictEqual(readable._readableState.needReadable, true);
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readable.push('foo');
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readable.push(null);
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readable.on('end', common.mustCall(() => {
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// No need to emit readable anymore when the stream ends.
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assert.strictEqual(readable._readableState.needReadable, false);
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}));
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const asyncReadable = new Readable({
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read: common.noop
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});
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asyncReadable.on('readable', common.mustCall(() => {
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if (asyncReadable.read() !== null) {
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// After each read(), the buffer is empty.
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// If the stream doesn't end now,
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// then we need to notify the reader on future changes.
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assert.strictEqual(asyncReadable._readableState.needReadable, true);
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}
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}, 3));
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process.nextTick(common.mustCall(() => {
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asyncReadable.push('foooo');
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}));
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process.nextTick(common.mustCall(() => {
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asyncReadable.push('bar');
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}));
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process.nextTick(common.mustCall(() => {
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asyncReadable.push(null);
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}));
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const flowing = new Readable({
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read: common.noop
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});
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// Notice this must be above the on('data') call.
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flowing.push('foooo');
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flowing.push('bar');
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flowing.push('quo');
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process.nextTick(common.mustCall(() => {
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flowing.push(null);
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}));
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// When the buffer already has enough data, and the stream is
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// in flowing mode, there is no need for the readable event.
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flowing.on('data', common.mustCall(function(data) {
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assert.strictEqual(flowing._readableState.needReadable, false);
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}, 3));
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const slowProducer = new Readable({
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read: common.noop
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});
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slowProducer.on('readable', common.mustCall(() => {
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if (slowProducer.read(8) === null) {
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// The buffer doesn't have enough data, and the stream is not need,
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// we need to notify the reader when data arrives.
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assert.strictEqual(slowProducer._readableState.needReadable, true);
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} else {
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assert.strictEqual(slowProducer._readableState.needReadable, false);
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}
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}, 4));
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process.nextTick(common.mustCall(() => {
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slowProducer.push('foo');
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}));
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process.nextTick(common.mustCall(() => {
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slowProducer.push('foo');
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}));
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process.nextTick(common.mustCall(() => {
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slowProducer.push('foo');
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}));
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process.nextTick(common.mustCall(() => {
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slowProducer.push(null);
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}));
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