`runTests.sh -s phpCsFixer` doesn't actually fix the code

[oliverklee]

Summary

runTests.sh -s phpCsFixer doesn't fix fixable code style warnings.

Steps to reproduce the problem

1. Move the { in a PHP class to the end of the previous line.
2. Run runTests.sh -s phpCsFixer.
3. Check whether the code is fixed.

Actual behavior

The code is unchanged.

Expected behaviour

The code is fixed.