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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)
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if(stream.write(array.shift()) === false)
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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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, 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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, 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', function(assert) {
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var l = 1000
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, 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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, count = 0
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stream.on('data', function (data) {
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count++
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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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