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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* Fakes a Chrome event that supports one listener.
* @constructor
* @extends {ChromeEvent}
*/
function FakeChromeEvent() {
/**
* @private
* @type {Function}
*/
this.listener_ = null;
}
FakeChromeEvent.prototype = {
/**
* Fakes the corresponding call on a Chrome event. Sets the listener and
* fails the test if it is already set.
* @param {Function} listener The new listener.
*/
addListener: function(listener) {
this.assertNoListener();
this.listener_ = listener;
},
/**
* Gets the listener of the event, failing the test if there's none.
* @return {Function} The event's listener.
*/
getListener: function() {
assertNotEquals(null, this.listener_);
return this.listener_;
},
/**
* Asserts that this object doesn't have any listener added.
*/
assertNoListener: function() {
assertEquals(null, this.listener_);
}
};
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