The Tor Browser: addon-sdk/source/test/test-event-target.js@b8a032363ba2 (annotated)

addon-sdk/source/test/test-event-target.js@b8a032363ba2 (annotated)

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

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* 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);