The Tor Browser: addon-sdk/source/test/test-events.js@ac0c01689b40 (annotated)

addon-sdk/source/test/test-events.js@ac0c01689b40 (annotated)

addon-sdk/source/test/test-events.js

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* 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 { LoaderWithHookedConsole } = require("sdk/test/loader");
 // Exposing private methods as public in order to test
 const EventEmitter = require('sdk/deprecated/events').EventEmitter.compose({
   listeners: function(type) this._listeners(type),
   emit: function() this._emit.apply(this, arguments),
   emitOnObject: function() this._emitOnObject.apply(this, arguments),
   removeAllListeners: function(type) this._removeAllListeners(type)
 });
 exports['test:add listeners'] = function(assert) {
   let e = new EventEmitter();
   let events_new_listener_emited = [];
   let times_hello_emited = 0;
   e.on("newListener", function (event, listener) {
     events_new_listener_emited.push(event)
   })
   e.on("hello", function (a, b) {
     times_hello_emited += 1
     assert.equal("a", a)
     assert.equal("b", b)
     assert.equal(this, e, '`this` pseudo-variable is bound to instance');
   })
   e.emit("hello", "a", "b")
 };
 exports['test:removeListener'] = function(assert) {
   let count = 0;
   function listener1 () {
     count++;
   }
   function listener2 () {
     count++;
   }
   // test adding and removing listener
   let e1 = new EventEmitter();
   assert.equal(0, e1.listeners('hello').length);
   e1.on("hello", listener1);
   assert.equal(1, e1.listeners('hello').length);
   assert.equal(listener1, e1.listeners('hello')[0]);
   e1.removeListener("hello", listener1);
   assert.equal(0, e1.listeners('hello').length);
   e1.emit("hello", "");
   assert.equal(0, count);
   // test adding one listener and removing another which was not added
   let e2 = new EventEmitter();
   assert.equal(0, e2.listeners('hello').length);
   e2.on("hello", listener1);
   assert.equal(1, e2.listeners('hello').length);
   e2.removeListener("hello", listener2);
   assert.equal(1, e2.listeners('hello').length);
   assert.equal(listener1, e2.listeners('hello')[0]);
   e2.emit("hello", "");
   assert.equal(1, count);
   // test adding 2 listeners, and removing one
   let e3 = new EventEmitter();
   assert.equal(0, e3.listeners('hello').length);
   e3.on("hello", listener1);
   assert.equal(1, e3.listeners('hello').length);
   e3.on("hello", listener2);
   assert.equal(2, e3.listeners('hello').length);
   e3.removeListener("hello", listener1);
   assert.equal(1, e3.listeners('hello').length);
   assert.equal(listener2, e3.listeners('hello')[0]);
   e3.emit("hello", "");
   assert.equal(2, count);
 };
 exports['test:removeAllListeners'] = function(assert) {
   let count = 0;
   function listener1 () {
     count++;
   }
   function listener2 () {
     count++;
   }
   // test adding a listener and removing all of that type
   let e1 = new EventEmitter();
   e1.on("hello", listener1);
   assert.equal(1, e1.listeners('hello').length);
   e1.removeAllListeners("hello");
   assert.equal(0, e1.listeners('hello').length);
   e1.emit("hello", "");
   assert.equal(0, count);
   // test adding a listener and removing all of another type
   let e2 = new EventEmitter();
   e2.on("hello", listener1);
   assert.equal(1, e2.listeners('hello').length);
   e2.removeAllListeners('goodbye');
   assert.equal(1, e2.listeners('hello').length);
   e2.emit("hello", "");
   assert.equal(1, count);
   // test adding 1+ listeners and removing all of that type
   let e3 = new EventEmitter();
   e3.on("hello", listener1);
   assert.equal(1, e3.listeners('hello').length);
   e3.on("hello", listener2);
   assert.equal(2, e3.listeners('hello').length);
   e3.removeAllListeners("hello");
   assert.equal(0, e3.listeners('hello').length);
   e3.emit("hello", "");
   assert.equal(1, count);
   // test adding 2 listeners for 2 types and removing all listeners
   let e4 = new EventEmitter();
   e4.on("hello", listener1);
   assert.equal(1, e4.listeners('hello').length);
   e4.on('goodbye', listener2);
   assert.equal(1, e4.listeners('goodbye').length);
   e4.emit("goodbye", "");
   e4.removeAllListeners();
   assert.equal(0, e4.listeners('hello').length);
   assert.equal(0, e4.listeners('goodbye').length);
   e4.emit("hello", "");
   e4.emit("goodbye", "");
   assert.equal(2, count);
 };
 exports['test: modify in emit'] = function(assert) {
   let callbacks_called = [ ];
   let e = new EventEmitter();
   function callback1() {
     callbacks_called.push("callback1");
     e.on("foo", callback2);
     e.on("foo", callback3);
     e.removeListener("foo", callback1);
   }
   function callback2() {
     callbacks_called.push("callback2");
     e.removeListener("foo", callback2);
   }
   function callback3() {
     callbacks_called.push("callback3");
     e.removeListener("foo", callback3);
   }
   e.on("foo", callback1);
   assert.equal(1, e.listeners("foo").length);
   e.emit("foo");
   assert.equal(2, e.listeners("foo").length);
   assert.equal(1, callbacks_called.length);
   assert.equal('callback1', callbacks_called[0]);
   e.emit("foo");
   assert.equal(0, e.listeners("foo").length);
   assert.equal(3, callbacks_called.length);
   assert.equal('callback1', callbacks_called[0]);
   assert.equal('callback2', callbacks_called[1]);
   assert.equal('callback3', callbacks_called[2]);
   e.emit("foo");
   assert.equal(0, e.listeners("foo").length);
   assert.equal(3, callbacks_called.length);
   assert.equal('callback1', callbacks_called[0]);
   assert.equal('callback2', callbacks_called[1]);
   assert.equal('callback3', callbacks_called[2]);
   e.on("foo", callback1);
   e.on("foo", callback2);
   assert.equal(2, e.listeners("foo").length);
   e.removeAllListeners("foo");
   assert.equal(0, e.listeners("foo").length);
   // Verify that removing callbacks while in emit allows emits to propagate to
   // all listeners
   callbacks_called = [ ];
   e.on("foo", callback2);
   e.on("foo", callback3);
   assert.equal(2, e.listeners("foo").length);
   e.emit("foo");
   assert.equal(2, callbacks_called.length);
   assert.equal('callback2', callbacks_called[0]);
   assert.equal('callback3', callbacks_called[1]);
   assert.equal(0, e.listeners("foo").length);
 };
 exports['test:adding same listener'] = function(assert) {
   function foo() {}
   let e = new EventEmitter();
   e.on("foo", foo);
   e.on("foo", foo);
   assert.equal(
 ,
     e.listeners("foo").length,
     "listener reregistration is ignored"
  );
 }
 exports['test:errors are reported if listener throws'] = function(assert) {
   let e = new EventEmitter(),
       reported = false;
   e.on('error', function(e) reported = true)
   e.on('boom', function() { throw new Error('Boom!') });
   e.emit('boom', 3);
   assert.ok(reported, 'error should be reported through event');
 };
 exports['test:emitOnObject'] = function(assert) {
   let e = new EventEmitter();
   e.on("foo", function() {
     assert.equal(this, e, "`this` should be emitter");
   });
   e.emitOnObject(e, "foo");
   e.on("bar", function() {
     assert.equal(this, obj, "`this` should be other object");
   });
   let obj = {};
   e.emitOnObject(obj, "bar");
 };
 exports['test:once'] = function(assert) {
   let e = new EventEmitter();
   let called = false;
   e.once('foo', function(value) {
     assert.ok(!called, "listener called only once");
     assert.equal(value, "bar", "correct argument was passed");
   });
   e.emit('foo', 'bar');
   e.emit('foo', 'baz');
 };
 exports["test:removing once"] = function(assert) {
   let e = require("sdk/deprecated/events").EventEmitterTrait.create();
   e.once("foo", function() { assert.pass("listener was called"); });
   e.once("error", function() { assert.fail("error event was emitted"); });
   e._emit("foo", "bug-656684");
 };
 // Bug 726967: Ensure that `emit` doesn't do an infinite loop when `error`
 // listener throws an exception
 exports['test:emitLoop'] = function(assert) {
   // Override the console for this test so it doesn't log the exception to the
   // test output
   let { loader } = LoaderWithHookedConsole(module);
   let EventEmitter = loader.require('sdk/deprecated/events').EventEmitter.compose({
     listeners: function(type) this._listeners(type),
     emit: function() this._emit.apply(this, arguments),
     emitOnObject: function() this._emitOnObject.apply(this, arguments),
     removeAllListeners: function(type) this._removeAllListeners(type)
   });
   let e = new EventEmitter();
   e.on("foo", function() {
     throw new Error("foo");
   });
   e.on("error", function() {
     throw new Error("error");
   });
   e.emit("foo");
   assert.pass("emit didn't looped");
 };
 require('sdk/test').run(exports);