import test from 'ava' import StateMachine from '../src/app' //------------------------------------------------------------------------------------------------- test('state cannot be modified directly', t => { var fsm = new StateMachine({ transitions: [ { name: 'step', from: 'none', to: 'complete' } ] }) t.is(fsm.state, 'none') var error = t.throws(() => { fsm.state = 'other' }) t.is(error.message, 'use transitions to change state') t.is(fsm.state, 'none') }) //------------------------------------------------------------------------------------------------- test('StateMachine.apply only allowed on objects', t => { var config = { transitions: [ { name: 'step', from: 'none', to: 'complete' } ] }; var error = t.throws(() => { StateMachine.apply(function() {}, config) }) t.is(error.message, 'StateMachine can only be applied to objects') error = t.throws(() => { StateMachine.apply([], config) }) t.is(error.message, 'StateMachine can only be applied to objects') error = t.throws(() => { StateMachine.apply(42, config) }) t.is(error.message, 'StateMachine can only be applied to objects') }) //------------------------------------------------------------------------------------------------- test('invalid transition raises an exception', t => { var fsm = new StateMachine({ transitions: [ { name: 'step1', from: 'none', to: 'A' }, { name: 'step2', from: 'A', to: 'B' } ] }); t.is(fsm.state, 'none') t.is(fsm.can('step1'), true) t.is(fsm.can('step2'), false) const error = t.throws(() => { fsm.step2(); }) t.is(error.message, 'transition is invalid in current state') t.is(error.transition, 'step2') t.is(error.from, 'none') t.is(error.to, undefined) t.is(error.current, 'none') }) //------------------------------------------------------------------------------------------------- test('invalid transition handler can be customized', t => { var fsm = new StateMachine({ transitions: [ { name: 'step1', from: 'none', to: 'A' }, { name: 'step2', from: 'A', to: 'B' } ], methods: { onInvalidTransition: function() { return 'custom error'; } } }); t.is(fsm.state, 'none') t.is(fsm.can('step1'), true) t.is(fsm.can('step2'), false) t.is(fsm.step2(), 'custom error') t.is(fsm.state, 'none') }) //------------------------------------------------------------------------------------------------- test('fire transition while existing transition is still in process raises an exception', t => { var fsm = new StateMachine({ transitions: [ { name: 'step', from: 'none', to: 'A' }, { name: 'other', from: '*', to: 'X' } ], methods: { onBeforeStep: function() { this.other(); }, onBeforeOther: function() { t.fail('should never happen') }, onEnterX: function() { t.fail('should never happen') } } }); t.is(fsm.state, 'none') t.is(fsm.can('step'), true) t.is(fsm.can('other'), true) const error = t.throws(() => { fsm.step() }) t.is(error.message, 'transition is invalid while previous transition is still in progress') t.is(error.transition, 'other') t.is(error.from, 'none') t.is(error.to, 'X') t.is(error.current, 'none') t.is(fsm.state, 'none', 'entire transition was cancelled by the exception') }) //------------------------------------------------------------------------------------------------- test('pending transition handler can be customized', t => { var error = "", fsm = new StateMachine({ transitions: [ { name: 'step', from: 'none', to: 'A' }, { name: 'other', from: '*', to: 'X' } ], methods: { onBeforeStep: function() { error = this.other(); return false }, onPendingTransition: function() { return 'custom error' }, onBeforeOther: function() { t.fail('should never happen') }, onEnterX: function() { t.fail('should never happen') } } }); t.is(fsm.state, 'none') t.is(fsm.can('step'), true) t.is(fsm.can('other'), true) t.is(fsm.step(), false) t.is(fsm.state, 'none') t.is(error, 'custom error') }) //-------------------------------------------------------------------------------------------------