def test_system_retrieval(self):
s = Scene(None)
sys = System()
s.add_system(sys)
self.assertTrue(s.get_system("System") is sys)
def test_controller_registration(self):
s = Scene(None)
c = Controller(s)
s.add_system(c)
self.assertTrue(c.scene is s)
self.assertTrue(c is s.get_system('Controller'))