setMentor() public method

public setMentor ( ECommerceCustomer $mentor )
$mentor ECommerceCustomer
 private function _createFixture()
 {
     $customer = new ECommerceCustomer();
     $customer->setName('Luke Skywalker');
     $mentor = new ECommerceCustomer();
     $mentor->setName('Obi-wan Kenobi');
     $customer->setMentor($mentor);
     $this->_em->persist($customer);
     $this->_em->flush();
     $this->_em->clear();
 }