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