public function convertObjectToIdentityArrayThrowsExceptionIfIdentityForTheGivenObjectCantBeDetermined()
{
$someObject = new \stdClass();
$this->abstractPersistenceManager->expects($this->once())->method('getIdentifierByObject')->with($someObject)->will($this->returnValue(null));
$this->abstractPersistenceManager->convertObjectToIdentityArray($someObject);
}