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stream, test: test _readableState.emittedReadable
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Part of #8683, increase coverage of the internal
state machine of streams.

PR-URL: #10249
See: #8683
See: #10230
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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joyeecheung authored and MylesBorins committed Jan 23, 2017
1 parent 906092b commit f26213a
Showing 1 changed file with 70 additions and 0 deletions.
70 changes: 70 additions & 0 deletions test/parallel/test-stream-readable-emittedReadable.js
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'use strict';
const common = require('../common');
const assert = require('assert');
const Readable = require('stream').Readable;

const readable = new Readable({
read: () => {}
});

// Initialized to false.
assert.strictEqual(readable._readableState.emittedReadable, false);

readable.on('readable', common.mustCall(() => {
// emittedReadable should be true when the readable event is emitted
assert.strictEqual(readable._readableState.emittedReadable, true);
readable.read();
// emittedReadable is reset to false during read()
assert.strictEqual(readable._readableState.emittedReadable, false);
}, 4));

// When the first readable listener is just attached,
// emittedReadable should be false
assert.strictEqual(readable._readableState.emittedReadable, false);

// Each one of these should trigger a readable event.
process.nextTick(common.mustCall(() => {
readable.push('foo');
}));
process.nextTick(common.mustCall(() => {
readable.push('bar');
}));
process.nextTick(common.mustCall(() => {
readable.push('quo');
}));
process.nextTick(common.mustCall(() => {
readable.push(null);
}));

const noRead = new Readable({
read: () => {}
});

noRead.on('readable', common.mustCall(() => {
// emittedReadable should be true when the readable event is emitted
assert.strictEqual(noRead._readableState.emittedReadable, true);
noRead.read(0);
// emittedReadable is not reset during read(0)
assert.strictEqual(noRead._readableState.emittedReadable, true);
}));

noRead.push('foo');
noRead.push(null);

const flowing = new Readable({
read: () => {}
});

flowing.on('data', common.mustCall(() => {
// When in flowing mode, emittedReadable is always false.
assert.strictEqual(flowing._readableState.emittedReadable, false);
flowing.read();
assert.strictEqual(flowing._readableState.emittedReadable, false);
}, 3));

flowing.push('foooo');
flowing.push('bar');
flowing.push('quo');
process.nextTick(common.mustCall(() => {
flowing.push(null);
}));

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