Restructure tests in render module

Fixed a code style issue with unused use statements.

Thanks for fixing the code style issue.

Please take a look at BuildTest.php. I replaced the mode append with merge, because append is tested a lot in the other test classes.

I do not know exactly if all the test values make complete sense. Feel free to adapt. At least we can run that particularly piece of code now.

This makes perfect sense, thanks so much for restructuring the tests. This is now so much more useful.

Automatically closed - issue fixed for 2 weeks with no activity.