protected function runTestSet($testSetName)
 {
     parent::runTestSet($testSetName);
     $assertionFile = "{$testSetName}_assertions.php";
     if (file_exists($assertionFile)) {
         $assertionObject = (include $assertionFile);
         $assertionReflection = new ReflectionObject($assertionObject);
         foreach ($assertionReflection->getMethods() as $assertionMethod) {
             $assertionMethod->invoke($assertionObject, $this->backend);
         }
     }
 }