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test: stream readableState readingMore state

PR-URL: #9868
Refs: #8685
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>
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chmln authored and italoacasas committed Dec 1, 2016
1 parent 8dbf1af commit 8621ccc25a3da62bfc8e756e34b4238c35fab8a4
Showing with 65 additions and 0 deletions.
  1. +65 −0 test/parallel/test-stream-readable-reading-readingMore.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(size) {}
});

const state = readable._readableState;

// Starting off with false initially.
assert.strictEqual(state.reading, false);
assert.strictEqual(state.readingMore, false);

readable.on('data', common.mustCall((data) => {
// while in a flowing state, should try to read more.
if (state.flowing)
assert.strictEqual(state.readingMore, true);

// reading as long as we've not ended
assert.strictEqual(state.reading, !state.ended);
}, 2));

function onStreamEnd() {
// End of stream; state.reading is false
// And so should be readingMore.
assert.strictEqual(state.readingMore, false);
assert.strictEqual(state.reading, false);
}

readable.on('readable', common.mustCall(() => {
// 'readable' always gets called before 'end'
// since 'end' hasn't been emitted, more data could be incoming
assert.strictEqual(state.readingMore, true);

// if the stream has ended, we shouldn't be reading
assert.strictEqual(state.ended, !state.reading);

if (readable.read() === null) // reached end of stream
process.nextTick(common.mustCall(onStreamEnd, 1));
}, 2));

readable.on('end', common.mustCall(onStreamEnd));

readable.push('pushed');

// stop emitting 'data' events
readable.pause();

// read() should only be called while operating in paused mode
readable.read(6);

// reading
assert.strictEqual(state.reading, true);
assert.strictEqual(state.readingMore, true);

// resume emitting 'data' events
readable.resume();

// add chunk to front
readable.unshift('unshifted');

// end
readable.push(null);

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