UNPKG

1.51 kBJavaScriptView Raw
1var test = require('tape')
2var through = require('../')
3
4// must emit end before close.
5
6test('buffering', function(assert) {
7 var ts = through(function (data) {
8 this.queue(data)
9 }, function () {
10 this.queue(null)
11 })
12
13 var ended = false, actual = []
14
15 ts.on('data', actual.push.bind(actual))
16 ts.on('end', function () {
17 ended = true
18 })
19
20 ts.write(1)
21 ts.write(2)
22 ts.write(3)
23 assert.deepEqual(actual, [1, 2, 3])
24 ts.pause()
25 ts.write(4)
26 ts.write(5)
27 ts.write(6)
28 assert.deepEqual(actual, [1, 2, 3])
29 ts.resume()
30 assert.deepEqual(actual, [1, 2, 3, 4, 5, 6])
31 ts.pause()
32 ts.end()
33 assert.ok(!ended)
34 ts.resume()
35 assert.ok(ended)
36 assert.end()
37})
38
39test('buffering has data in queue, when ends', function (assert) {
40
41 /*
42 * If stream ends while paused with data in the queue,
43 * stream should still emit end after all data is written
44 * on resume.
45 */
46
47 var ts = through(function (data) {
48 this.queue(data)
49 }, function () {
50 this.queue(null)
51 })
52
53 var ended = false, actual = []
54
55 ts.on('data', actual.push.bind(actual))
56 ts.on('end', function () {
57 ended = true
58 })
59
60 ts.pause()
61 ts.write(1)
62 ts.write(2)
63 ts.write(3)
64 ts.end()
65 assert.deepEqual(actual, [], 'no data written yet, still paused')
66 assert.ok(!ended, 'end not emitted yet, still paused')
67 ts.resume()
68 assert.deepEqual(actual, [1, 2, 3], 'resumed, all data should be delivered')
69 assert.ok(ended, 'end should be emitted once all data was delivered')
70 assert.end();
71})