michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 'use strict';
michael@0: 
michael@0: const { emit } = require('sdk/event/core');
michael@0: const { EventTarget } = require('sdk/event/target');
michael@0: const { Loader } = require('sdk/test/loader');
michael@0: 
michael@0: exports['test add a listener'] = function(assert) {
michael@0:   let events = [ { name: 'event#1' }, 'event#2' ];
michael@0:   let target = EventTarget();
michael@0: 
michael@0:   target.on('message', function(message) {
michael@0:     assert.equal(this, target, 'this is a target object');
michael@0:     assert.equal(message, events.shift(), 'message is emitted event');
michael@0:   });
michael@0: 
michael@0:   emit(target, 'message', events[0]);
michael@0:   emit(target, 'message', events[0]);
michael@0: };
michael@0: 
michael@0: exports['test pass in listeners'] = function(assert) {
michael@0:   let actual = [ ];
michael@0:   let target = EventTarget({
michael@0:     onMessage: function onMessage(message) {
michael@0:       assert.equal(this, target, 'this is an event target');
michael@0:       actual.push(1);
michael@0:     },
michael@0:     onFoo: null,
michael@0:     onbla: function() {
michael@0:       assert.fail('`onbla` is not supposed to be called');
michael@0:     }
michael@0:   });
michael@0:   target.on('message', function(message) {
michael@0:     assert.equal(this, target, 'this is an event target');
michael@0:     actual.push(2);
michael@0:   });
michael@0: 
michael@0:   emit(target, 'message');
michael@0:   emit(target, 'missing');
michael@0: 
michael@0:   assert.deepEqual([ 1, 2 ], actual, 'all listeners trigerred in right order');
michael@0: };
michael@0: 
michael@0: exports['test that listener is unique per type'] = function(assert) {
michael@0:   let actual = []
michael@0:   let target = EventTarget();
michael@0:   function listener() { actual.push(1) }
michael@0:   target.on('message', listener);
michael@0:   target.on('message', listener);
michael@0:   target.on('message', listener);
michael@0:   target.on('foo', listener);
michael@0:   target.on('foo', listener);
michael@0: 
michael@0:   emit(target, 'message');
michael@0:   assert.deepEqual([ 1 ], actual, 'only one message listener added');
michael@0:   emit(target, 'foo');
michael@0:   assert.deepEqual([ 1, 1 ], actual, 'same listener added for other event');
michael@0: };
michael@0: 
michael@0: exports['test event type matters'] = function(assert) {
michael@0:   let target = EventTarget();
michael@0:   target.on('message', function() {
michael@0:     assert.fail('no event is expected');
michael@0:   });
michael@0:   target.on('done', function() {
michael@0:     assert.pass('event is emitted');
michael@0:   });
michael@0: 
michael@0:   emit(target, 'foo');
michael@0:   emit(target, 'done');
michael@0: };
michael@0: 
michael@0: exports['test all arguments are pasesd'] = function(assert) {
michael@0:   let foo = { name: 'foo' }, bar = 'bar';
michael@0:   let target = EventTarget();
michael@0:   target.on('message', function(a, b) {
michael@0:     assert.equal(a, foo, 'first argument passed');
michael@0:     assert.equal(b, bar, 'second argument passed');
michael@0:   });
michael@0:   emit(target, 'message', foo, bar);
michael@0: };
michael@0: 
michael@0: exports['test no side-effects in emit'] = function(assert) {
michael@0:   let target = EventTarget();
michael@0:   target.on('message', function() {
michael@0:     assert.pass('first listener is called');
michael@0:     target.on('message', function() {
michael@0:       assert.fail('second listener is called');
michael@0:     });
michael@0:   });
michael@0:   emit(target, 'message');
michael@0: };
michael@0: 
michael@0: exports['test order of propagation'] = function(assert) {
michael@0:   let actual = [];
michael@0:   let target = EventTarget();
michael@0:   target.on('message', function() { actual.push(1); });
michael@0:   target.on('message', function() { actual.push(2); });
michael@0:   target.on('message', function() { actual.push(3); });
michael@0:   emit(target, 'message');
michael@0:   assert.deepEqual([ 1, 2, 3 ], actual, 'called in order they were added');
michael@0: };
michael@0: 
michael@0: exports['test remove a listener'] = function(assert) {
michael@0:   let target = EventTarget();
michael@0:   let actual = [];
michael@0:   target.on('message', function listener() {
michael@0:     actual.push(1);
michael@0:     target.on('message', function() {
michael@0:       target.removeListener('message', listener);
michael@0:       actual.push(2);
michael@0:     })
michael@0:   });
michael@0: 
michael@0:   target.off('message'); // must do nothing.
michael@0:   emit(target, 'message');
michael@0:   assert.deepEqual([ 1 ], actual, 'first listener called');
michael@0:   emit(target, 'message');
michael@0:   assert.deepEqual([ 1, 1, 2 ], actual, 'second listener called');
michael@0:   emit(target, 'message');
michael@0:   assert.deepEqual([ 1, 1, 2, 2, 2 ], actual, 'first listener removed');
michael@0: };
michael@0: 
michael@0: exports['test error handling'] = function(assert) {
michael@0:   let target = EventTarget();
michael@0:   let error = Error('boom!');
michael@0: 
michael@0:   target.on('message', function() { throw error; })
michael@0:   target.on('error', function(boom) {
michael@0:     assert.equal(boom, error, 'thrown exception causes error event');
michael@0:   });
michael@0:   emit(target, 'message');
michael@0: };
michael@0: 
michael@0: exports['test unhandled errors'] = function(assert) {
michael@0:   let exceptions = [];
michael@0:   let loader = Loader(module);
michael@0:   let { emit } = loader.require('sdk/event/core');
michael@0:   let { EventTarget } = loader.require('sdk/event/target');
michael@0:   Object.defineProperties(loader.sandbox('sdk/event/core'), {
michael@0:     console: { value: {
michael@0:       exception: function(e) {
michael@0:         exceptions.push(e);
michael@0:       }
michael@0:     }}
michael@0:   });
michael@0:   let target = EventTarget();
michael@0:   let boom = Error('Boom!');
michael@0:   let drax = Error('Draax!!');
michael@0: 
michael@0:   target.on('message', function() { throw boom; });
michael@0: 
michael@0:   emit(target, 'message');
michael@0:   assert.ok(~String(exceptions[0]).indexOf('Boom!'),
michael@0:             'unhandled exception is logged');
michael@0: 
michael@0:   target.on('error', function() { throw drax; });
michael@0:   emit(target, 'message');
michael@0:   assert.ok(~String(exceptions[1]).indexOf('Draax!'),
michael@0:             'error in error handler is logged');
michael@0: };
michael@0: 
michael@0: exports['test target is chainable'] = function (assert, done) {
michael@0:   let loader = Loader(module);
michael@0:   let exceptions = [];
michael@0:   let { EventTarget } = loader.require('sdk/event/target');
michael@0:   let { emit } = loader.require('sdk/event/core');
michael@0:   Object.defineProperties(loader.sandbox('sdk/event/core'), {
michael@0:     console: { value: {
michael@0:       exception: function(e) {
michael@0:         exceptions.push(e);
michael@0:       }
michael@0:     }}
michael@0:   });
michael@0: 
michael@0:   let emitter = EventTarget();
michael@0:   let boom = Error('Boom');
michael@0:   let onceCalled = 0;
michael@0:   
michael@0:   emitter.once('oneTime', function () {
michael@0:     assert.equal(++onceCalled, 1, 'once event called only once');
michael@0:   }).on('data', function (message) {
michael@0:     assert.equal(message, 'message', 'handles event');
michael@0:     emit(emitter, 'oneTime');
michael@0:     emit(emitter, 'data2', 'message2');
michael@0:   }).on('phony', function () {
michael@0:     assert.fail('removeListener does not remove chained event');
michael@0:   }).removeListener('phony')
michael@0:   .on('data2', function (message) {
michael@0:     assert.equal(message, 'message2', 'handle chained event');
michael@0:     emit(emitter, 'oneTime');
michael@0:     throw boom;
michael@0:   }).on('error', function (error) {
michael@0:     assert.equal(error, boom, 'error handled in chained event');
michael@0:     done();
michael@0:   });
michael@0: 
michael@0:   emit(emitter, 'data', 'message');
michael@0: };
michael@0: 
michael@0: require('test').run(exports);
michael@0: