assertRegExp("/^[a-z0-9]{" . $length . "}?$/", $guid); } function testGuidWithoutParameter() { $guid = System::createGUID(); $this->assertGuid($guid, 16); } function testGuidWithSize32() { $guid = System::createGUID(32); $this->assertGuid($guid, 32); } function testGuidWithSize64() { $guid = System::createGUID(64); $this->assertGuid($guid, 64); } }