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test: writable stream needDrain state
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Add a test for _writableState.needDrain.

PR-URL: #8799
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Related: #8686
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italoacasas authored and Myles Borins committed Nov 18, 2016
1 parent 8cf7368 commit 4b50419
Showing 1 changed file with 23 additions and 0 deletions.
23 changes: 23 additions & 0 deletions test/parallel/test-stream-writable-needdrain-state.js
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'use strict';

const common = require('../common');
const stream = require('stream');
const assert = require('assert');

const transform = new stream.Transform({
transform: _transform,
highWaterMark: 1
});

function _transform(chunk, encoding, cb) {
assert.strictEqual(transform._writableState.needDrain, true);
cb();
}

assert.strictEqual(transform._writableState.needDrain, false);

transform.write('asdasd', common.mustCall(() => {
assert.strictEqual(transform._writableState.needDrain, false);
}));

assert.strictEqual(transform._writableState.needDrain, true);

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