test.js
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var tape = require('tape')
var thunky = require('./')
tape('run only once', function (t) {
t.plan(3)
var ran = 0
var run = thunky(function (cb) {
ran++
cb()
})
run(function () {
t.same(ran, 1, 'ran once')
})
run(function () {
t.same(ran, 1, 'ran once')
})
run(function () {
t.same(ran, 1, 'ran once')
})
})
tape('run only once async', function (t) {
t.plan(3)
var ran = 0
var run = thunky(function (cb) {
process.nextTick(function () {
ran++
cb()
})
})
run(function () {
t.same(ran, 1, 'ran once')
})
run(function () {
t.same(ran, 1, 'ran once')
})
run(function () {
t.same(ran, 1, 'ran once')
})
})
tape('re-run on error', function (t) {
t.plan(3)
var ran = 0
var run = thunky(function (cb) {
ran++
cb(new Error('stop'))
})
run(function () {
t.same(ran, 1, 'ran once')
run(function () {
t.same(ran, 2, 'ran once')
run(function () {
t.same(ran, 3, 'ran once')
})
})
})
})
tape('pass arguments', function (t) {
t.plan(6)
var ran = 0
var run = thunky(function (fn) {
ran++
fn({ hello: 'world' })
})
run(function (val) {
t.same(ran, 1, 'ran once')
t.same(val, { hello: 'world' })
run(function (val) {
t.same(ran, 1, 'ran once')
t.same(val, { hello: 'world' })
run(function (val) {
t.same(ran, 1, 'ran once')
t.same(val, { hello: 'world' })
})
})
})
})
tape('callback is optional', function (t) {
t.plan(2)
var ran = 0
var run = thunky(function (fn) {
ran++
fn({ hello: 'world' })
})
run()
run(function (val) {
t.same(ran, 1, 'ran once')
t.same(val, { hello: 'world' })
})
})
tape('always async', function (t) {
t.plan(2)
var run = thunky(function (cb) {
process.nextTick(cb)
})
var sync = true
run(function () {
t.ok(!sync, 'not sync')
var innerSync = true
run(function () {
t.ok(!innerSync, 'not sync')
})
innerSync = false
})
sync = false
})