Google Summer of Code 2016 JavaScript Testing project: Tests for combobox.js library.

[Ruchiranga]

Pull Request extending #11420 by adding tests written for combobox.js library.

Summary of Changes

This PR includes a new set of test cases written for the combobox.js JavaScript library of Joomla!.

Testing Instructions

None, since this is only run on Travis. If you want to run it locally, please take a look at the documentation available here.

[zero-24]

@Ruchiranga can we change the doc blocks similiar to ther other doc blocks?

[zero-24]

/**
 * @package     Joomla.Tests
 * @subpackage  JavaScript Tests
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 *
 * @since       __DEPLOY_VERSION__
 * @version     1.0.0
 */

[Ruchiranga]

@zero-24 done.

[zero-24]

Thanks @Ruchiranga 👍

[zero-24]

I have tested this item ✅ successfully on 73b7a46

travis is ok. Thanks

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11810.}

[yvesh]

I have tested this item ✅ successfully on f73b0c4

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11810.}

[zero-24]

RTC

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11810.}

[brianteeman]

Thanks