100 lines
2.1 KiB
JavaScript
100 lines
2.1 KiB
JavaScript
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'use strict';
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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;
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var 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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// If stream ends while paused with data in the queue, stream should still emit end after all data is written on resume.
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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;
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var 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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test('data pauses', function (t) {
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var ts = through();
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var results = [];
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ts.on('data', function (data) {
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ts.pause();
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results.push(data);
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});
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t.equal(ts.paused, false, 'starts not paused');
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ts.write(1);
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t.equal(ts.paused, true, 'pauses on write');
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ts.write(2);
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t.equal(ts.paused, true, 'pauses on write');
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ts.write(3);
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t.equal(ts.paused, true, 'pauses on write');
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t.deepEqual(results, [1], 'has not been resumed');
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ts.resume();
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t.equal(ts.paused, true, 'resume unpauses, but write re-pauses');
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t.deepEqual(results, [1, 2], 'has only been resumed once');
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ts.resume();
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t.deepEqual(results, [1, 2, 3], 'has been resumed twice');
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t.end();
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});
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