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qwen/nodejs/node_modules/fastq/test/test.js

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+'use strict'
+
+/* eslint-disable no-var */
+
+var test = require('tape')
+var buildQueue = require('../')
+
+test('concurrency', function (t) {
+  t.plan(6)
+  t.throws(buildQueue.bind(null, worker, 0))
+  t.throws(buildQueue.bind(null, worker, NaN))
+  t.doesNotThrow(buildQueue.bind(null, worker, 1))
+
+  var queue = buildQueue(worker, 1)
+  t.throws(function () {
+    queue.concurrency = 0
+  })
+  t.throws(function () {
+    queue.concurrency = NaN
+  })
+  t.doesNotThrow(function () {
+    queue.concurrency = 2
+  })
+
+  function worker (arg, cb) {
+    cb(null, true)
+  }
+})
+
+test('worker execution', function (t) {
+  t.plan(3)
+
+  var queue = buildQueue(worker, 1)
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  })
+
+  function worker (arg, cb) {
+    t.equal(arg, 42)
+    cb(null, true)
+  }
+})
+
+test('limit', function (t) {
+  t.plan(4)
+
+  var expected = [10, 0]
+  var queue = buildQueue(worker, 1)
+
+  queue.push(10, result)
+  queue.push(0, result)
+
+  function result (err, arg) {
+    t.error(err, 'no error')
+    t.equal(arg, expected.shift(), 'the result matches')
+  }
+
+  function worker (arg, cb) {
+    setTimeout(cb, arg, null, arg)
+  }
+})
+
+test('multiple executions', function (t) {
+  t.plan(15)
+
+  var queue = buildQueue(worker, 1)
+  var toExec = [1, 2, 3, 4, 5]
+  var count = 0
+
+  toExec.forEach(function (task) {
+    queue.push(task, done)
+  })
+
+  function done (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, toExec[count - 1], 'the result matches')
+  }
+
+  function worker (arg, cb) {
+    t.equal(arg, toExec[count], 'arg matches')
+    count++
+    setImmediate(cb, null, arg)
+  }
+})
+
+test('multiple executions, one after another', function (t) {
+  t.plan(15)
+
+  var queue = buildQueue(worker, 1)
+  var toExec = [1, 2, 3, 4, 5]
+  var count = 0
+
+  queue.push(toExec[0], done)
+
+  function done (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, toExec[count - 1], 'the result matches')
+    if (count < toExec.length) {
+      queue.push(toExec[count], done)
+    }
+  }
+
+  function worker (arg, cb) {
+    t.equal(arg, toExec[count], 'arg matches')
+    count++
+    setImmediate(cb, null, arg)
+  }
+})
+
+test('set this', function (t) {
+  t.plan(3)
+
+  var that = {}
+  var queue = buildQueue(that, worker, 1)
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(this, that, 'this matches')
+  })
+
+  function worker (arg, cb) {
+    t.equal(this, that, 'this matches')
+    cb(null, true)
+  }
+})
+
+test('drain', function (t) {
+  t.plan(4)
+
+  var queue = buildQueue(worker, 1)
+  var worked = false
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  })
+
+  queue.drain = function () {
+    t.equal(true, worked, 'drained')
+  }
+
+  function worker (arg, cb) {
+    t.equal(arg, 42)
+    worked = true
+    setImmediate(cb, null, true)
+  }
+})
+
+test('pause && resume', function (t) {
+  t.plan(13)
+
+  var queue = buildQueue(worker, 1)
+  var worked = false
+  var expected = [42, 24]
+
+  t.notOk(queue.paused, 'it should not be paused')
+
+  queue.pause()
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  })
+
+  queue.push(24, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  })
+
+  t.notOk(worked, 'it should be paused')
+  t.ok(queue.paused, 'it should be paused')
+
+  queue.resume()
+  queue.pause()
+  queue.resume()
+  queue.resume() // second resume is a no-op
+
+  function worker (arg, cb) {
+    t.notOk(queue.paused, 'it should not be paused')
+    t.ok(queue.running() <= queue.concurrency, 'should respect the concurrency')
+    t.equal(arg, expected.shift())
+    worked = true
+    process.nextTick(function () { cb(null, true) })
+  }
+})
+
+test('pause in flight && resume', function (t) {
+  t.plan(16)
+
+  var queue = buildQueue(worker, 1)
+  var expected = [42, 24, 12]
+
+  t.notOk(queue.paused, 'it should not be paused')
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+    t.ok(queue.paused, 'it should be paused')
+    process.nextTick(function () {
+      queue.resume()
+      queue.pause()
+      queue.resume()
+    })
+  })
+
+  queue.push(24, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+    t.notOk(queue.paused, 'it should not be paused')
+  })
+
+  queue.push(12, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+    t.notOk(queue.paused, 'it should not be paused')
+  })
+
+  queue.pause()
+
+  function worker (arg, cb) {
+    t.ok(queue.running() <= queue.concurrency, 'should respect the concurrency')
+    t.equal(arg, expected.shift())
+    process.nextTick(function () { cb(null, true) })
+  }
+})
+
+test('altering concurrency', function (t) {
+  t.plan(24)
+
+  var queue = buildQueue(worker, 1)
+
+  queue.push(24, workDone)
+  queue.push(24, workDone)
+  queue.push(24, workDone)
+
+  queue.pause()
+
+  queue.concurrency = 3 // concurrency changes are ignored while paused
+  queue.concurrency = 2
+
+  queue.resume()
+
+  t.equal(queue.running(), 2, '2 jobs running')
+
+  queue.concurrency = 3
+
+  t.equal(queue.running(), 3, '3 jobs running')
+
+  queue.concurrency = 1
+
+  t.equal(queue.running(), 3, '3 jobs running') // running jobs can't be killed
+
+  queue.push(24, workDone)
+  queue.push(24, workDone)
+  queue.push(24, workDone)
+  queue.push(24, workDone)
+
+  function workDone (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  }
+
+  function worker (arg, cb) {
+    t.ok(queue.running() <= queue.concurrency, 'should respect the concurrency')
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('idle()', function (t) {
+  t.plan(12)
+
+  var queue = buildQueue(worker, 1)
+
+  t.ok(queue.idle(), 'queue is idle')
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+    t.notOk(queue.idle(), 'queue is not idle')
+  })
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+    // it will go idle after executing this function
+    setImmediate(function () {
+      t.ok(queue.idle(), 'queue is now idle')
+    })
+  })
+
+  t.notOk(queue.idle(), 'queue is not idle')
+
+  function worker (arg, cb) {
+    t.notOk(queue.idle(), 'queue is not idle')
+    t.equal(arg, 42)
+    setImmediate(cb, null, true)
+  }
+})
+
+test('saturated', function (t) {
+  t.plan(9)
+
+  var queue = buildQueue(worker, 1)
+  var preworked = 0
+  var worked = 0
+
+  queue.saturated = function () {
+    t.pass('saturated')
+    t.equal(preworked, 1, 'started 1 task')
+    t.equal(worked, 0, 'worked zero task')
+  }
+
+  queue.push(42, done)
+  queue.push(42, done)
+
+  function done (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  }
+
+  function worker (arg, cb) {
+    t.equal(arg, 42)
+    preworked++
+    setImmediate(function () {
+      worked++
+      cb(null, true)
+    })
+  }
+})
+
+test('length', function (t) {
+  t.plan(7)
+
+  var queue = buildQueue(worker, 1)
+
+  t.equal(queue.length(), 0, 'nothing waiting')
+  queue.push(42, done)
+  t.equal(queue.length(), 0, 'nothing waiting')
+  queue.push(42, done)
+  t.equal(queue.length(), 1, 'one task waiting')
+  queue.push(42, done)
+  t.equal(queue.length(), 2, 'two tasks waiting')
+
+  function done (err, result) {
+    t.error(err, 'no error')
+  }
+
+  function worker (arg, cb) {
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('getQueue', function (t) {
+  t.plan(10)
+
+  var queue = buildQueue(worker, 1)
+
+  t.equal(queue.getQueue().length, 0, 'nothing waiting')
+  queue.push(42, done)
+  t.equal(queue.getQueue().length, 0, 'nothing waiting')
+  queue.push(42, done)
+  t.equal(queue.getQueue().length, 1, 'one task waiting')
+  t.equal(queue.getQueue()[0], 42, 'should be equal')
+  queue.push(43, done)
+  t.equal(queue.getQueue().length, 2, 'two tasks waiting')
+  t.equal(queue.getQueue()[0], 42, 'should be equal')
+  t.equal(queue.getQueue()[1], 43, 'should be equal')
+
+  function done (err, result) {
+    t.error(err, 'no error')
+  }
+
+  function worker (arg, cb) {
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('unshift', function (t) {
+  t.plan(8)
+
+  var queue = buildQueue(worker, 1)
+  var expected = [1, 2, 3, 4]
+
+  queue.push(1, done)
+  queue.push(4, done)
+  queue.unshift(3, done)
+  queue.unshift(2, done)
+
+  function done (err, result) {
+    t.error(err, 'no error')
+  }
+
+  function worker (arg, cb) {
+    t.equal(expected.shift(), arg, 'tasks come in order')
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('unshift && empty', function (t) {
+  t.plan(2)
+
+  var queue = buildQueue(worker, 1)
+  var completed = false
+
+  queue.pause()
+
+  queue.empty = function () {
+    t.notOk(completed, 'the task has not completed yet')
+  }
+
+  queue.unshift(1, done)
+
+  queue.resume()
+
+  function done (err, result) {
+    completed = true
+    t.error(err, 'no error')
+  }
+
+  function worker (arg, cb) {
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('push && empty', function (t) {
+  t.plan(2)
+
+  var queue = buildQueue(worker, 1)
+  var completed = false
+
+  queue.pause()
+
+  queue.empty = function () {
+    t.notOk(completed, 'the task has not completed yet')
+  }
+
+  queue.push(1, done)
+
+  queue.resume()
+
+  function done (err, result) {
+    completed = true
+    t.error(err, 'no error')
+  }
+
+  function worker (arg, cb) {
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('kill', function (t) {
+  t.plan(5)
+
+  var queue = buildQueue(worker, 1)
+  var expected = [1]
+
+  var predrain = queue.drain
+
+  queue.drain = function drain () {
+    t.fail('drain should never be called')
+  }
+
+  queue.push(1, done)
+  queue.push(4, done)
+  queue.unshift(3, done)
+  queue.unshift(2, done)
+  queue.kill()
+
+  function done (err, result) {
+    t.error(err, 'no error')
+    setImmediate(function () {
+      t.equal(queue.length(), 0, 'no queued tasks')
+      t.equal(queue.running(), 0, 'no running tasks')
+      t.equal(queue.drain, predrain, 'drain is back to default')
+    })
+  }
+
+  function worker (arg, cb) {
+    t.equal(expected.shift(), arg, 'tasks come in order')
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('killAndDrain', function (t) {
+  t.plan(6)
+
+  var queue = buildQueue(worker, 1)
+  var expected = [1]
+
+  var predrain = queue.drain
+
+  queue.drain = function drain () {
+    t.pass('drain has been called')
+  }
+
+  queue.push(1, done)
+  queue.push(4, done)
+  queue.unshift(3, done)
+  queue.unshift(2, done)
+  queue.killAndDrain()
+
+  function done (err, result) {
+    t.error(err, 'no error')
+    setImmediate(function () {
+      t.equal(queue.length(), 0, 'no queued tasks')
+      t.equal(queue.running(), 0, 'no running tasks')
+      t.equal(queue.drain, predrain, 'drain is back to default')
+    })
+  }
+
+  function worker (arg, cb) {
+    t.equal(expected.shift(), arg, 'tasks come in order')
+    setImmediate(function () {
+      cb(null, true)
+    })
+  }
+})
+
+test('pause && idle', function (t) {
+  t.plan(11)
+
+  var queue = buildQueue(worker, 1)
+  var worked = false
+
+  t.notOk(queue.paused, 'it should not be paused')
+  t.ok(queue.idle(), 'should be idle')
+
+  queue.pause()
+
+  queue.push(42, function (err, result) {
+    t.error(err, 'no error')
+    t.equal(result, true, 'result matches')
+  })
+
+  t.notOk(worked, 'it should be paused')
+  t.ok(queue.paused, 'it should be paused')
+  t.notOk(queue.idle(), 'should not be idle')
+
+  queue.resume()
+
+  t.notOk(queue.paused, 'it should not be paused')
+  t.notOk(queue.idle(), 'it should not be idle')
+
+  function worker (arg, cb) {
+    t.equal(arg, 42)
+    worked = true
+    process.nextTick(cb.bind(null, null, true))
+    process.nextTick(function () {
+      t.ok(queue.idle(), 'is should be idle')
+    })
+  }
+})
+
+test('push without cb', function (t) {
+  t.plan(1)
+
+  var queue = buildQueue(worker, 1)
+
+  queue.push(42)
+
+  function worker (arg, cb) {
+    t.equal(arg, 42)
+    cb()
+  }
+})
+
+test('unshift without cb', function (t) {
+  t.plan(1)
+
+  var queue = buildQueue(worker, 1)
+
+  queue.unshift(42)
+
+  function worker (arg, cb) {
+    t.equal(arg, 42)
+    cb()
+  }
+})
+
+test('push with worker throwing error', function (t) {
+  t.plan(5)
+  var q = buildQueue(function (task, cb) {
+    cb(new Error('test error'), null)
+  }, 1)
+  q.error(function (err, task) {
+    t.ok(err instanceof Error, 'global error handler should catch the error')
+    t.match(err.message, /test error/, 'error message should be "test error"')
+    t.equal(task, 42, 'The task executed should be passed')
+  })
+  q.push(42, function (err) {
+    t.ok(err instanceof Error, 'push callback should catch the error')
+    t.match(err.message, /test error/, 'error message should be "test error"')
+  })
+})
+
+test('unshift with worker throwing error', function (t) {
+  t.plan(5)
+  var q = buildQueue(function (task, cb) {
+    cb(new Error('test error'), null)
+  }, 1)
+  q.error(function (err, task) {
+    t.ok(err instanceof Error, 'global error handler should catch the error')
+    t.match(err.message, /test error/, 'error message should be "test error"')
+    t.equal(task, 42, 'The task executed should be passed')
+  })
+  q.unshift(42, function (err) {
+    t.ok(err instanceof Error, 'unshift callback should catch the error')
+    t.match(err.message, /test error/, 'error message should be "test error"')
+  })
+})
+
+test('pause/resume should trigger drain event', function (t) {
+  t.plan(1)
+
+  var queue = buildQueue(worker, 1)
+  queue.pause()
+  queue.drain = function () {
+    t.pass('drain should be called')
+  }
+
+  function worker (arg, cb) {
+    cb(null, true)
+  }
+
+  queue.resume()
+})
+
+test('paused flag', function (t) {
+  t.plan(2)
+
+  var queue = buildQueue(function (arg, cb) {
+    cb(null)
+  }, 1)
+  t.equal(queue.paused, false)
+  queue.pause()
+  t.equal(queue.paused, true)
+})