PHPUnit_Framework_TestSuite::addTestFiles PHP Method

    public function addTestFiles($filenames)
    {
        if (!(is_array($filenames) || is_object($filenames) && $filenames instanceof Iterator)) {
            throw PHPUnit_Util_InvalidArgumentHelper::factory(1, 'array or iterator');
        }
        foreach ($filenames as $filename) {
            $this->addTestFile((string) $filename);
        }
    }

 public static function suite()
 {
     $suite = new PHPUnit_Framework_TestSuite('Structures_Graph Tests');
     $dir = new GlobIterator(dirname(__FILE__) . '/*Test.php');
     $suite->addTestFiles($dir);
     return $suite;
 }