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test.js
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test.js
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const test = require('tape')
const fsm = require('./')
test('should validate input values', function (t) {
t.plan(4)
t.throws(fsm.bind(null, 123, 123), /string/)
t.throws(fsm.bind(null, 'UP', 123), /object/)
const state1 = {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
}
t.doesNotThrow(fsm.bind(null, 'UP', state1))
const state2 = {
UP: {down: 'DOWN'},
DOWN: {up: 'END'}
}
t.throws(fsm.bind(null, 'UP', state2), /state/)
})
test('m.on() should attach events', function (t) {
t.plan(2)
const m = fsm('UP', {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
})
m.on('DOWN', function () {
t.pass('cb called')
})
t.equal(typeof m._emitter._events['DOWN'], 'function')
m('down')
})
test('m.emit() should catch invalid state transitions', function (t) {
t.plan(3)
const m = fsm('UP', {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
})
t.equal(m._state, 'UP')
m('down')
t.equal(m._state, 'DOWN')
m.on('error', function (err) {
t.equal(err, 'invalid transition: DOWN -> END')
})
m('END')
})
test('m.emit() should set the state', function (t) {
t.plan(3)
const m = fsm('UP', {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
})
m.on('DOWN', function () {
t.pass('cb called')
})
t.equal(m._state, 'UP')
m('down')
t.equal(m._state, 'DOWN')
})
test('m.emit() should emit enter events', function (t) {
t.plan(2)
const m = fsm('UP', {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
})
m.on('UP:enter', function (cb) {
t.pass('enter')
cb()
})
m.on('UP', function () {
t.pass('UP')
})
m.emit('down')
m.emit('up')
})
test('m.emit() should emit events in sequence', function (t) {
t.plan(5)
var i = 0
const m = fsm('DOWN', {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
})
m.on('UP:enter', function (cb) {
t.equal(++i, 1)
cb()
})
m.on('UP', function () {
t.equal(++i, 2)
})
m.on('UP:leave', function (cb) {
t.equal(++i, 3)
cb()
})
m.on('DOWN:enter', function (cb) {
t.equal(++i, 4)
cb()
})
m.on('DOWN', function () {
t.equal(++i, 5)
})
m.emit('up')
m.emit('down')
})
test('should emit an end event when done', function (t) {
t.plan(1)
const m = fsm('DOWN', {
UP: {down: 'DOWN'},
DOWN: {up: 'UP'}
})
m.on('done', function () {
t.pass('called')
})
m.emit('up')
})