fix codestyle according to psr and changed the visibility of the setUp into protected

You are right, the PSR don't say about this, but the cs-fixer by Fabien Potencier fixes it.
https://github.com/fabpot/PHP-CS-Fixer
``new_with_braces [all] All instances created with new keyword must be followed by braces.``
https://github.com/fabpot/PHP-CS-Fixer/blob/master/Symfony/CS/Fixer/NewWithBracesFixer.php
Here is the discussion: https://github.com/fabpot/PHP-CS-Fixer/issues/384 (I have a git hook that fixes my code before commits, this is the reason that I changed it), if you want, I can remove these ``()`` for you.