Create tests for the module

Thanks to the patch of @jcnventura ( https://www.drupal.org/node/784672#comment-10350027 → ), i tried to port the test in a stand alone test class of the module.

I had some troubles making this working. Here is what i succeed to do so far.
I didn't succeed to create a user with the permission "'administer filters", even if the module depends on the field and filter module.

Thanks to @floretan for this great day working with you at DrupalCon Barcelona ! :)