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