PHPUnit_Runner_IncludePathTestCollector::collectTests PHP Method

    public function collectTests()
    {
        $iterator = File_Iterator_Factory::getFileIterator($this->paths, $this->suffixes, $this->prefixes);
        if ($this->filterIterator !== NULL) {
            $class = new ReflectionClass($this->filterIterator);
            $iterator = $class->newInstance($iterator);
        }
        return $iterator;
    }

 public static function suite()
 {
     $suite = new SimpleContactForm_AllTests('SimpleContactForm Tests');
     $testCollector = new PHPUnit_Runner_IncludePathTestCollector(array(dirname(__FILE__) . '/cases'));
     $suite->addTestFiles($testCollector->collectTests());
     return $suite;
 }