public function testGetId()
 {
     $this->assertNull($this->entity->getId());
     $value = 42;
     $idReflection = new \ReflectionProperty(get_class($this->entity), 'id');
     $idReflection->setAccessible(true);
     $idReflection->setValue($this->entity, $value);
     $this->assertEquals($value, $this->entity->getId());
 }