Subtheme of barrio
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var es = require('../')
, it = require('it-is').style('colour')
, d = require('ubelt')
function readStream(stream, pauseAt, done) {
if(!done) done = pauseAt, pauseAt = -1
var array = []
stream.on('data', function (data) {
array.push(data)
if(!--pauseAt )
stream.pause(), done(null, array)
})
stream.on('error', done)
stream.on('end', function (data) {
done(null, array)
})
}
exports ['read an array'] = function (test) {
var readThis = d.map(3, 6, 100, d.id) //array of multiples of 3 < 100
var reader = es.readArray(readThis)
var writer = es.writeArray(function (err, array){
if(err) throw err //unpossible
it(array).deepEqual(readThis)
test.done()
})
reader.pipe(writer)
}
exports ['read an array and pause it.'] = function (test) {
var readThis = d.map(3, 6, 100, d.id) //array of multiples of 3 < 100
var reader = es.readArray(readThis)
readStream(reader, 10, function (err, data) {
if(err) throw err
it(data).deepEqual([3, 6, 9, 12, 15, 18, 21, 24, 27, 30])
readStream(reader, 10, function (err, data) {
it(data).deepEqual([33, 36, 39, 42, 45, 48, 51, 54, 57, 60])
test.done()
})
reader.resume()
})
}
exports ['reader is readable, but not writeable'] = function (test) {
var reader = es.readArray([1])
it(reader).has({
readable: true,
writable: false
})
test.done()
}
exports ['read one item per tick'] = function (test) {
var readThis = d.map(3, 6, 100, d.id) //array of multiples of 3 < 100
var drains = 0
var reader = es.readArray(readThis)
var tickMapper = es.map(function (data,callback) {
process.nextTick(function () {
callback(null, data)
})
//since tickMapper is returning false
//pipe should pause the writer until a drain occurs
return false
})
reader.pipe(tickMapper)
readStream(tickMapper, function (err, array) {
it(array).deepEqual(readThis)
it(array.length).deepEqual(readThis.length)
it(drains).equal(readThis.length)
test.done()
})
tickMapper.on('drain', function () {
drains ++
})
}
require('./helper')(module)