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var test = require('tape')
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var through = require('../')
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// must emit end before close.
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test('buffering', function(assert) {
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var ts = through(function (data) {
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this.queue(data)
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}, function () {
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this.queue(null)
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})
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var ended = false, actual = []
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ts.on('data', actual.push.bind(actual))
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ts.on('end', function () {
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ended = true
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})
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ts.write(1)
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ts.write(2)
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ts.write(3)
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assert.deepEqual(actual, [1, 2, 3])
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ts.pause()
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ts.write(4)
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ts.write(5)
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ts.write(6)
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assert.deepEqual(actual, [1, 2, 3])
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ts.resume()
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assert.deepEqual(actual, [1, 2, 3, 4, 5, 6])
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ts.pause()
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ts.end()
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assert.ok(!ended)
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ts.resume()
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assert.ok(ended)
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assert.end()
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})
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test('buffering has data in queue, when ends', function (assert) {
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/*
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* If stream ends while paused with data in the queue,
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* stream should still emit end after all data is written
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* on resume.
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*/
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var ts = through(function (data) {
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this.queue(data)
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}, function () {
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this.queue(null)
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})
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var ended = false, actual = []
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ts.on('data', actual.push.bind(actual))
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ts.on('end', function () {
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ended = true
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})
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ts.pause()
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ts.write(1)
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ts.write(2)
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ts.write(3)
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ts.end()
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assert.deepEqual(actual, [], 'no data written yet, still paused')
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assert.ok(!ended, 'end not emitted yet, still paused')
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ts.resume()
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assert.deepEqual(actual, [1, 2, 3], 'resumed, all data should be delivered')
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assert.ok(ended, 'end should be emitted once all data was delivered')
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assert.end();
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})
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