138 lines
2.5 KiB
JavaScript
138 lines
2.5 KiB
JavaScript
'use strict';
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var test = require('tape');
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var spec = require('stream-spec');
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var through = require('../');
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/*
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*I'm using these two functions, and not streams and pipe
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*so there is less to break. if this test fails it must be
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*the implementation of _through_
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*/
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function write(array, stream) {
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array = array.slice();
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function next() {
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while (array.length) { if (stream.write(array.shift()) === false) { return stream.once('drain', next); } }
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stream.end();
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}
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next();
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}
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function read(stream, callback) {
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var actual = [];
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stream.on('data', function (data) {
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actual.push(data);
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});
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stream.once('end', function () {
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callback(null, actual);
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});
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stream.once('error', function (err) {
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callback(err);
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});
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}
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test('simple defaults', function (assert) {
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var l = 1000;
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var expected = [];
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while (l--) { expected.push(l * Math.random()); }
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var t = through();
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var s = spec(t).through().pausable();
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read(t, function (err, actual) {
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assert.ifError(err);
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assert.deepEqual(actual, expected);
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assert.end();
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});
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t.on('close', s.validate);
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write(expected, t);
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});
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test('simple functions', function (assert) {
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var l = 1000;
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var expected = [];
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while (l--) { expected.push(l * Math.random()); }
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var t = through(function (data) {
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this.emit('data', data * 2);
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});
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var s = spec(t).through().pausable();
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read(t, function (err, actual) {
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assert.ifError(err);
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assert.deepEqual(actual, expected.map(function (data) {
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return data * 2;
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}));
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assert.end();
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});
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t.on('close', s.validate);
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write(expected, t);
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});
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test('pauses twice', function (t) {
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var ts = through();
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t.equal(ts.pause(), ts, 'when pausing, returns stream');
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t.equal(ts.pause(), undefined, 'when already paused, returns void');
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t.end();
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});
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test('pauses', function (assert) {
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var l = 1000;
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var expected = [];
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while (l--) { expected.push(l); } // Math.random())
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var t = through();
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var s = spec(t)
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.through()
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.pausable();
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t.on('data', function () {
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if (Math.random() > 0.1) { return; }
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t.pause();
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process.nextTick(function () {
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t.resume();
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});
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});
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read(t, function (err, actual) {
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assert.ifError(err);
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assert.deepEqual(actual, expected);
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});
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t.on('close', function () {
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s.validate();
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assert.end();
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});
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write(expected, t);
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});
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test('does not soft-end on `undefined`', function (assert) {
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var stream = through();
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var count = 0;
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stream.on('data', function () {
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count += 1;
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});
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stream.write(undefined);
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stream.write(undefined);
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assert.equal(count, 2);
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assert.end();
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});
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