Fix: Actually append Test to name of file containing test

[localheinz]

This PR

• appends Test to the name of a file containing a test

🙎 Otherwise it never gets executed, right?

Before

$ vendor/bin/phpunit 

PHPUnit 4.8.26 by Sebastian Bergmann and contributors.

...............................................................  63 / 271 ( 23%)
..............................S................................ 126 / 271 ( 46%)
............................................................... 189 / 271 ( 69%)
........................................S...................... 252 / 271 ( 92%)
...................

Time: 9.89 seconds, Memory: 17.00MB

OK, but incomplete, skipped, or risky tests!
Tests: 271, Assertions: 613, Skipped: 2.

After

$ vendor/bin/phpunit 

PHPUnit 4.8.26 by Sebastian Bergmann and contributors.

...............................................................  63 / 280 ( 22%)
.......................................S....................... 126 / 280 ( 45%)
............................................................... 189 / 280 ( 67%)
.................................................S............. 252 / 280 ( 90%)
............................

Time: 10.26 seconds, Memory: 17.25MB

OK, but incomplete, skipped, or risky tests!
Tests: 280, Assertions: 632, Skipped: 2.

[SammyK]

Thanks! :)