public function testReadPropertyIsIgnoredIfPropertyPathIsNull()
 {
     $author = new Author();
     $author->child = new Author();
     $standaloneChild = new Author();
     $form = new Form('child');
     $form->setData($standaloneChild);
     $form->setPropertyPath(null);
     $form->readProperty($author);
     // should not be $author->child!!
     $this->assertSame($standaloneChild, $form->getData());
 }