OK things are clearer now, thanks for the explanation. The test case you want is done for the Turkish language. 

`it('should load the language with the exact match first even if a wildcard is used'`

So it tries to use the exact language first, then goes to the alias or wildcarded option. In the test case, we have `tr_*` -> `tr` alias, but also `tr_TR` language is added to the available language keys. So if `tr_TR` is requested, it will try to load `tr_TR` first, if it's not in the available language keys, then it tries to find the wildcarded alias.