Just updated to the latest xUnit version and PHPUnit's XML logfile is no longer processed correctly:
[xUnit] Starting to record.
[xUnit] [PHPUnit-5.1.6 (default)] - Processing 1 files with the pattern 'build/logs/junit.xml' relative to '/usr/local/hudson/jobs/php-object-freezer/workspace'.
[xUnit] [WARNING] - The file '/usr/local/hudson/jobs/php-object-freezer/workspace/build/logs/junit.xml' is an invalid file. It has been ignored.
[xUnit] The plugin hasn't been performed correctly: java.io.IOException: No test report files were found. Configuration error?