/**
  * @expectedException \Symfony\Component\Form\Exception\UnexpectedTypeException
  * @expectedExceptionMessageExpected Expected argument of type "array", "string" given
  */
 public function testTransformFailsWhenValueInNotAnArray()
 {
     $transformer = new EntityToIdTransformer($this->getMockEntityManager(), 'TestClass', 'id', null);
     $transformer->transform('invalid value');
 }