public function testFindByRefOneSimple()
 {
     $user = new User();
     $account = new Account('name');
     $user->setAccountSimple($account);
     $this->dm->persist($user);
     $this->dm->persist($account);
     $this->dm->flush();
     $this->assertSame($user, $this->dm->getRepository(User::class)->findOneBy(['accountSimple' => $account]));
 }