PHPUnit reports a PHPUnit_Framework_Exception-Collection of common programming errors

I added a simple test to a bundle.

As suggested in the manual I tried to have PHPUnit load the configuration with:

phpunit -c /app

phpunit.xml looks like this:

    
        
            ../src/*Bundle/Tests
        
    
 

The error message I get is:

root@h0x03:/var/www/fi/FrontendIntegrator# phpunit -c app/
PHP Fatal error:  Uncaught exception 'PHPUnit_Framework_Exception' with message 'Neither "Project Test Suite.php" nor "Project Test Suite.php" could be opened.' in /usr/share/php/PHPUnit/Util/Skeleton/Test.php:102
Stack trace:
#0 /usr/share/php/PHPUnit/TextUI/Command.php(157): PHPUnit_Util_Skeleton_Test->__construct('Project Test Su...', '')
#1 /usr/share/php/PHPUnit/TextUI/Command.php(129): PHPUnit_TextUI_Command->run(Array, true)
#2 /usr/bin/phpunit(49): PHPUnit_TextUI_Command::main()
#3 {main}
  thrown in /usr/share/php/PHPUnit/Util/Skeleton/Test.php on line 102

PHPUnit apparently loads the file and tries to find a PHP-file named after the test suites name. I cannot find any information on why it does so or how such a file should look like.