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test.js
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test.js
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var test = require('tape')
var parallel = require('./')
test('basically works', function (t) {
t.plan(6)
var instance = parallel({
released: released
})
var count = 0
var obj = {}
instance(obj, [something, something], 42, function done () {
t.equal(count, 2, 'all functions must have completed')
})
function something (arg, cb) {
t.equal(obj, this)
t.equal(arg, 42)
setImmediate(function () {
count++
cb()
})
}
function released () {
t.pass('release')
}
})
test('accumulates results', function (t) {
t.plan(8)
var instance = parallel({
released: released
})
var count = 0
var obj = {}
instance(obj, [something, something], 42, function done (err, results) {
t.notOk(err, 'no error')
t.equal(count, 2, 'all functions must have completed')
t.deepEqual(results, [1, 2])
})
function something (arg, cb) {
t.equal(obj, this)
t.equal(arg, 42)
setImmediate(function () {
count++
cb(null, count)
})
}
function released () {
t.pass()
}
})
test('fowards errs', function (t) {
t.plan(3)
var instance = parallel({
released: released
})
var count = 0
var obj = {}
instance(obj, [somethingErr, something], 42, function done (err, results) {
t.ok(err)
t.equal(count, 2, 'all functions must have completed')
})
function something (arg, cb) {
setImmediate(function () {
count++
cb(null, count)
})
}
function somethingErr (arg, cb) {
setImmediate(function () {
count++
cb(new Error('this is an err!'))
})
}
function released () {
t.pass()
}
})
test('fowards errs (bis)', function (t) {
t.plan(3)
var instance = parallel({
released: released
})
var count = 0
var obj = {}
instance(obj, [something, somethingErr], 42, function done (err, results) {
t.ok(err)
t.equal(count, 2, 'all functions must have completed')
})
function something (arg, cb) {
setImmediate(function () {
count++
cb(null, count)
})
}
function somethingErr (arg, cb) {
setImmediate(function () {
count++
cb(new Error('this is an err!'))
})
}
function released () {
t.pass()
}
})
test('does not forward errors or result with results:false flag', function (t) {
t.plan(8)
var instance = parallel({
released: released,
results: false
})
var count = 0
var obj = {}
instance(obj, [something, something], 42, function done (err, results) {
t.equal(err, undefined, 'no err')
t.equal(results, undefined, 'no err')
t.equal(count, 2, 'all functions must have completed')
})
function something (arg, cb) {
t.equal(obj, this)
t.equal(arg, 42)
setImmediate(function () {
count++
cb()
})
}
function released () {
t.pass()
}
})
test('should call done and released if an empty is passed', function (t) {
t.plan(2)
var instance = parallel({
released: released
})
var obj = {}
instance(obj, [], 42, function done () {
t.pass()
})
function released () {
t.pass()
}
})
test('each support', function (t) {
t.plan(8)
var instance = parallel({
released: released
})
var count = 0
var obj = {}
var args = [1, 2, 3]
var i = 0
instance(obj, something, args, function done () {
t.equal(count, 3, 'all functions must have completed')
})
function something (arg, cb) {
t.equal(obj, this, 'this matches')
t.equal(args[i++], arg, 'the arg is correct')
setImmediate(function () {
count++
cb()
})
}
function released () {
t.pass()
}
})
test('call the callback with the given this', function (t) {
t.plan(1)
var instance = parallel()
var obj = {}
instance(obj, [build(), build()], 42, function done () {
t.equal(obj, this, 'this matches')
})
function build () {
return function something (arg, cb) {
setImmediate(cb)
}
}
})
test('call the callback with the given this with no results', function (t) {
t.plan(1)
var instance = parallel({ results: false })
var obj = {}
instance(obj, [build(), build()], 42, function done () {
t.equal(obj, this, 'this matches')
})
function build () {
return function something (arg, cb) {
setImmediate(cb)
}
}
})
test('call the callback with the given this with no data', function (t) {
t.plan(1)
var instance = parallel()
var obj = {}
instance(obj, [], 42, function done () {
t.equal(obj, this, 'this matches')
})
})
test('call the result callback when the each array is empty', function (t) {
t.plan(1)
var instance = parallel()
var obj = {}
instance(obj, something, [], function done () {
t.pass('the result function has been called')
})
function something (arg, cb) {
t.error('this should never be called')
}
})
test('call the result callback when the each array is empty with no results', function (t) {
t.plan(1)
var instance = parallel({ results: false })
var obj = {}
instance(obj, something, [], function done () {
t.pass('the result function has been called')
})
function something (arg, cb) {
t.error('this should never be called')
}
})
test('does not require a done callback', function (t) {
t.plan(4)
var instance = parallel()
var obj = {}
instance(obj, [something, something], 42)
function something (arg, cb) {
t.equal(obj, this)
t.equal(arg, 42)
setImmediate(cb)
}
})
test('works with sync functions with no results', function (t) {
t.plan(6)
var instance = parallel({
results: false,
released: released
})
var count = 0
var obj = {}
instance(obj, [something, something], 42, function done () {
t.equal(2, count, 'all functions must have completed')
})
function something (arg, cb) {
t.equal(this, obj)
t.equal(42, arg)
count++
cb()
}
function released () {
t.pass('release')
}
})
test('accumulates results in order', function (t) {
t.plan(8)
var instance = parallel({
released: released
})
var count = 2
var obj = {}
instance(obj, [something, something], 42, function done (err, results) {
t.notOk(err, 'no error')
t.equal(count, 0, 'all functions must have completed')
t.deepEqual(results, [2, 1])
})
function something (arg, cb) {
t.equal(obj, this)
t.equal(arg, 42)
var value = count--
setTimeout(function () {
cb(null, value)
}, 10 * value)
}
function released () {
t.pass()
}
})
test('call without arg if there is no arg with no results', function (t) {
t.plan(3)
var instance = parallel({
results: false
})
var count = 0
var obj = {}
instance(obj, [something, something], 42, function done () {
t.equal(count, 2, 'all functions must have completed')
})
function something (cb) {
t.equal(obj, this)
setImmediate(function () {
count++
cb()
})
}
})
test('call without arg if there is no arg with results', function (t) {
t.plan(3)
var instance = parallel()
var count = 0
var obj = {}
instance(obj, [something, something], 42, function done () {
t.equal(count, 2, 'all functions must have completed')
})
function something (cb) {
t.equal(obj, this)
setImmediate(function () {
count++
cb()
})
}
})
test('each support with nothing to process', function (t) {
t.plan(2)
var instance = parallel()
var obj = {}
var args = []
instance(obj, something, args, function done (err, results) {
t.error(err)
t.deepEqual(results, [], 'empty results')
})
function something (arg, cb) {
t.fail('this should never happen')
}
})
test('each without results support with nothing to process', function (t) {
t.plan(1)
var instance = parallel({ results: false })
var obj = {}
var args = []
instance(obj, something, args, function done () {
t.pass('done called')
})
function something (arg, cb) {
t.fail('this should never happen')
}
})
test('each works with arrays of objects', function (t) {
t.plan(3)
var instance = parallel({ results: false })
var obj = {}
var args = [{ val: true }, { val: true }]
instance(obj, something, args, function () {
t.ok('done called')
})
function something (arg, cb) {
t.ok(arg.val)
cb()
}
})
test('using same instance multiple times clears the state of result holder', function (t) {
var total = 10
t.plan(total)
var instance = parallel({
results: false,
released: released
})
var obj = {}
var count = 0
function released () {
if (count < total) {
instance(obj, [something], 42, function done () {
t.ok(true, 'done is called')
count++
})
}
}
released()
function something (cb) {
setImmediate(function () {
cb()
})
}
})