Manuel Pichler points out a small error in the documentation for the "merge-phpunit" command in the phpUnderControl package.

The @failonerror-attribute of the -tag in the merge target was set to false, which results in not failed CruiseControl builds. To fix this behaviour, you must modify the merge target in your build.xml.

He includes an example of the fix, showing where to change the failonerror attribute of the exec tag inside of the target. This is also corrected in the most current build, so update your software to prevent issue.