public function testObject()
 {
     $innerObject = ClassUtilsTestClass::create()->setText('inner Object');
     $source = ClassUtilsTestClass::create()->setObject($innerObject);
     $destination = ClassUtilsTestClass::create()->setText('old Text');
     ClassUtils::fillNullProperties($source, $destination);
     $this->assertTrue($destination->getObject() === $innerObject);
     $destination->dropObject();
     ClassUtils::copyNotNullProperties($source, $destination);
     $this->assertTrue($destination->getObject() === $innerObject);
 }