The Tor Browser: comparison addon-sdk/source/test/test-event-target.js

comparison: addon-sdk/source/test/test-event-target.js

addon-sdk/source/test/test-event-target.js

branch: TOR_BUG_9701
changeset 10: ac0c01689b40

equal deleted inserted replaced

--1:000000000000
+:edeb56c901a6
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+const { emit } = require('sdk/event/core');
+const { EventTarget } = require('sdk/event/target');
+const { Loader } = require('sdk/test/loader');
+exports['test add a listener'] = function(assert) {
+let events = [ { name: 'event#1' }, 'event#2' ];
+let target = EventTarget();
+target.on('message', function(message) {
+assert.equal(this, target, 'this is a target object');
+assert.equal(message, events.shift(), 'message is emitted event');
+});
+emit(target, 'message', events[0]);
+emit(target, 'message', events[0]);
+};
+exports['test pass in listeners'] = function(assert) {
+let actual = [ ];
+let target = EventTarget({
+onMessage: function onMessage(message) {
+assert.equal(this, target, 'this is an event target');
+actual.push(1);
+},
+onFoo: null,
+onbla: function() {
+assert.fail('`onbla` is not supposed to be called');
+}
+});
+target.on('message', function(message) {
+assert.equal(this, target, 'this is an event target');
+actual.push(2);
+});
+emit(target, 'message');
+emit(target, 'missing');
+assert.deepEqual([ 1, 2 ], actual, 'all listeners trigerred in right order');
+};
+exports['test that listener is unique per type'] = function(assert) {
+let actual = []
+let target = EventTarget();
+function listener() { actual.push(1) }
+target.on('message', listener);
+target.on('message', listener);
+target.on('message', listener);
+target.on('foo', listener);
+target.on('foo', listener);
+emit(target, 'message');
+assert.deepEqual([ 1 ], actual, 'only one message listener added');
+emit(target, 'foo');
+assert.deepEqual([ 1, 1 ], actual, 'same listener added for other event');
+};
+exports['test event type matters'] = function(assert) {
+let target = EventTarget();
+target.on('message', function() {
+assert.fail('no event is expected');
+});
+target.on('done', function() {
+assert.pass('event is emitted');
+});
+emit(target, 'foo');
+emit(target, 'done');
+};
+exports['test all arguments are pasesd'] = function(assert) {
+let foo = { name: 'foo' }, bar = 'bar';
+let target = EventTarget();
+target.on('message', function(a, b) {
+assert.equal(a, foo, 'first argument passed');
+assert.equal(b, bar, 'second argument passed');
+});
+emit(target, 'message', foo, bar);
+};
+exports['test no side-effects in emit'] = function(assert) {
+let target = EventTarget();
+target.on('message', function() {
+assert.pass('first listener is called');
+target.on('message', function() {
+assert.fail('second listener is called');
+});
+});
+emit(target, 'message');
+};
+exports['test order of propagation'] = function(assert) {
+let actual = [];
+let target = EventTarget();
+target.on('message', function() { actual.push(1); });
+target.on('message', function() { actual.push(2); });
+target.on('message', function() { actual.push(3); });
+emit(target, 'message');
+assert.deepEqual([ 1, 2, 3 ], actual, 'called in order they were added');
+};
+exports['test remove a listener'] = function(assert) {
+let target = EventTarget();
+let actual = [];
+target.on('message', function listener() {
+actual.push(1);
+target.on('message', function() {
+target.removeListener('message', listener);
+actual.push(2);
+})
+});
+target.off('message'); // must do nothing.
+emit(target, 'message');
+assert.deepEqual([ 1 ], actual, 'first listener called');
+emit(target, 'message');
+assert.deepEqual([ 1, 1, 2 ], actual, 'second listener called');
+emit(target, 'message');
+assert.deepEqual([ 1, 1, 2, 2, 2 ], actual, 'first listener removed');
+};
+exports['test error handling'] = function(assert) {
+let target = EventTarget();
+let error = Error('boom!');
+target.on('message', function() { throw error; })
+target.on('error', function(boom) {
+assert.equal(boom, error, 'thrown exception causes error event');
+});
+emit(target, 'message');
+};
+exports['test unhandled errors'] = function(assert) {
+let exceptions = [];
+let loader = Loader(module);
+let { emit } = loader.require('sdk/event/core');
+let { EventTarget } = loader.require('sdk/event/target');
+Object.defineProperties(loader.sandbox('sdk/event/core'), {
+console: { value: {
+exception: function(e) {
+exceptions.push(e);
+}
+}}
+});
+let target = EventTarget();
+let boom = Error('Boom!');
+let drax = Error('Draax!!');
+target.on('message', function() { throw boom; });
+emit(target, 'message');
+assert.ok(~String(exceptions[0]).indexOf('Boom!'),
+'unhandled exception is logged');
+target.on('error', function() { throw drax; });
+emit(target, 'message');
+assert.ok(~String(exceptions[1]).indexOf('Draax!'),
+'error in error handler is logged');
+};
+exports['test target is chainable'] = function (assert, done) {
+let loader = Loader(module);
+let exceptions = [];
+let { EventTarget } = loader.require('sdk/event/target');
+let { emit } = loader.require('sdk/event/core');
+Object.defineProperties(loader.sandbox('sdk/event/core'), {
+console: { value: {
+exception: function(e) {
+exceptions.push(e);
+}
+}}
+});
+let emitter = EventTarget();
+let boom = Error('Boom');
+let onceCalled = 0;
+emitter.once('oneTime', function () {
+assert.equal(++onceCalled, 1, 'once event called only once');
+}).on('data', function (message) {
+assert.equal(message, 'message', 'handles event');
+emit(emitter, 'oneTime');
+emit(emitter, 'data2', 'message2');
+}).on('phony', function () {
+assert.fail('removeListener does not remove chained event');
+}).removeListener('phony')
+.on('data2', function (message) {
+assert.equal(message, 'message2', 'handle chained event');
+emit(emitter, 'oneTime');
+throw boom;
+}).on('error', function (error) {
+assert.equal(error, boom, 'error handled in chained event');
+done();
+});
+emit(emitter, 'data', 'message');
+};
+require('test').run(exports);