VE-1588: Tests for ve.dm.WikiaTemplateModel

Because we make an API request to get all available parameters for a given template, we need to ensure that we don't add all of the empty parameters in the serialize() and getWikiText() methods. This test tests for this scenario.

https://wikia-inc.atlassian.net/browse/VE-1588
http://api.qunitjs.com/expect/ - "DEPRECATION Note: assert.expect was previously provided as QUnit.expect and the global expect, which still exist, but will be removed in QUnit 2.0.0."

So it should be assert.expect I think instead of QUnit.expect