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network-visualization/node_modules/map-stream/test/simple-map.asynct.js

@@ -0,0 +1,318 @@
+'use strict';
+
+var map = require('../')
+  , it = require('it-is')
+  , u = require('ubelt')
+  , spec = require('stream-spec')
+  , from = require('from')
+  , Stream = require('stream')
+  , es = require('event-stream')
+
+//REFACTOR THIS TEST TO USE es.readArray and es.writeArray
+
+function writeArray(array, stream) {
+
+  array.forEach( function (j) {
+    stream.write(j)
+  })
+  stream.end()
+
+}
+
+function readStream(stream, done) {
+
+  var array = [] 
+  stream.on('data', function (data) {
+    array.push(data)
+  })
+  stream.on('error', done)
+  stream.on('end', function (data) {
+    done(null, array)
+  })
+
+} 
+
+//call sink on each write,
+//and complete when finished.
+
+function pauseStream (prob, delay) { 
+  var pauseIf = (
+      'number' == typeof prob 
+    ? function () {
+        return Math.random() < prob
+      } 
+    : 'function' == typeof prob 
+    ? prob
+    : 0.1
+  )
+  var delayer = ( 
+      !delay 
+    ? process.nextTick
+    : 'number' == typeof delay 
+    ? function (next) { setTimeout(next, delay) }
+    : delay
+  )   
+
+  return es.through(function (data) {    
+    if(!this.paused && pauseIf()) {
+      console.log('PAUSE STREAM PAUSING')
+      this.pause()
+      var self = this
+      delayer(function () {
+        console.log('PAUSE STREAM RESUMING')
+        self.resume()
+      })
+    }
+    console.log("emit ('data', " + data + ')')
+    this.emit('data', data) 
+  })
+}
+
+exports ['simple map applied to a stream'] = function (test) {
+
+  var input = [1,2,3,7,5,3,1,9,0,2,4,6]
+  //create event stream from
+
+  var doubler = map(function (data, cb) {
+    cb(null, data * 2)
+  })
+
+  spec(doubler).through().validateOnExit()
+
+  //a map is only a middle man, so it is both readable and writable
+  
+  it(doubler).has({
+    readable: true,
+    writable: true,   
+  })
+
+  readStream(doubler, function (err, output) {
+    it(output).deepEqual(input.map(function (j) {
+      return j * 2
+    }))
+//    process.nextTick(x.validate)
+    test.done()
+  })
+  
+  writeArray(input, doubler)
+  
+}
+
+exports ['stream comes back in the correct order'] = function (test) {
+  var input = [3, 2, 1]
+
+  var delayer = map(function(data, cb){
+    setTimeout(function () {
+      cb(null, data)
+    }, 100 * data)
+  })
+
+  readStream(delayer, function (err, output) {
+    it(output).deepEqual(input)
+    test.done()
+  })
+
+  writeArray(input, delayer)
+}
+
+exports ['continues on error event with failures `true`'] = function (test) {
+  var input = [1, 2, 3]
+
+  var delayer = map(function(data, cb){
+    cb(new Error('Something gone wrong'), data)
+  }, { failures: true })
+
+  readStream(delayer, function (err, output) {
+    it(output).deepEqual(input)
+    test.done()
+  })
+
+  writeArray(input, delayer)
+}
+
+exports['pipe two maps together'] = function (test) {
+
+  var input = [1,2,3,7,5,3,1,9,0,2,4,6]
+  //create event stream from
+  function dd (data, cb) {
+    cb(null, data * 2)
+  }
+  var doubler1 = map(dd), doubler2 = map(dd)
+
+  doubler1.pipe(doubler2)
+  
+  spec(doubler1).through().validateOnExit()
+  spec(doubler2).through().validateOnExit()
+
+  readStream(doubler2, function (err, output) {
+    it(output).deepEqual(input.map(function (j) {
+      return j * 4
+    }))
+    test.done()
+  })
+  
+  writeArray(input, doubler1)
+
+}
+
+//next:
+//
+// test pause, resume and drian.
+//
+
+// then make a pipe joiner:
+//
+// plumber (evStr1, evStr2, evStr3, evStr4, evStr5)
+//
+// will return a single stream that write goes to the first 
+
+exports ['map will not call end until the callback'] = function (test) {
+
+  var ticker = map(function (data, cb) {
+    process.nextTick(function () {
+      cb(null, data * 2)
+    })
+  })
+
+  spec(ticker).through().validateOnExit()
+
+  ticker.write('x')
+  ticker.end() 
+
+  ticker.on('end', function () {
+    test.done()
+  })
+}
+
+exports ['emit failures with opts.failures === `ture`'] = function (test) {
+
+  var err = new Error('INTENSIONAL ERROR')
+    , mapper = 
+  map(function () {
+    throw err
+  }, { failures: true })
+
+  mapper.on('failure', function (_err) {
+    it(_err).equal(err)  
+    test.done()
+  })
+
+  mapper.write('hello')
+
+}
+
+exports ['emit error thrown'] = function (test) {
+
+  var err = new Error('INTENSIONAL ERROR')
+    , mapper = 
+  map(function () {
+    throw err
+  })
+
+  mapper.on('error', function (_err) {
+    it(_err).equal(err)  
+    test.done()
+  })
+
+  mapper.write('hello')
+
+}
+
+exports ['emit error calledback'] = function (test) {
+
+  var err = new Error('INTENSIONAL ERROR')
+    , mapper = 
+  map(function (data, callback) {
+    callback(err)
+  })
+
+  mapper.on('error', function (_err) {
+    it(_err).equal(err)  
+    test.done()
+  })
+
+  mapper.write('hello')
+
+}
+
+exports ['do not emit drain if not paused'] = function (test) {
+
+  var maps = map(function (data, callback) {
+    u.delay(callback)(null, 1)
+    return true
+  })
+  
+  spec(maps).through().pausable().validateOnExit()
+
+  maps.on('drain', function () {
+    it(false).ok('should not emit drain unless the stream is paused')
+  })
+
+  it(maps.write('hello')).equal(true)
+  it(maps.write('hello')).equal(true)
+  it(maps.write('hello')).equal(true)
+  setTimeout(function () {maps.end()},10)
+  maps.on('end', test.done)
+}
+
+exports ['emits drain if paused, when all '] = function (test) {
+  var active = 0
+  var drained = false
+  var maps = map(function (data, callback) {
+    active ++
+    u.delay(function () {
+      active --
+      callback(null, 1)
+    })()
+    console.log('WRITE', false)
+    return false
+  })
+
+  spec(maps).through().validateOnExit()
+
+  maps.on('drain', function () {
+    drained = true
+    it(active).equal(0, 'should emit drain when all maps are done')
+  })
+
+  it(maps.write('hello')).equal(false)
+  it(maps.write('hello')).equal(false)
+  it(maps.write('hello')).equal(false)
+
+  process.nextTick(function () {maps.end()},10)
+
+  maps.on('end', function () {
+    console.log('end')
+    it(drained).ok('shoud have emitted drain before end')
+    test.done() 
+  })
+
+}
+
+exports ['map applied to a stream with filtering'] = function (test) {
+
+  var input = [1,2,3,7,5,3,1,9,0,2,4,6]
+
+  var doubler = map(function (data, callback) {
+    if (data % 2)
+      callback(null, data * 2)
+    else
+      callback()
+  })
+  
+  readStream(doubler, function (err, output) {
+    it(output).deepEqual(input.filter(function (j) {
+      return j % 2
+    }).map(function (j) {
+      return j * 2
+    }))
+    test.done()
+  })
+  
+  spec(doubler).through().validateOnExit()
+
+  writeArray(input, doubler)
+  
+}
+
+