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