def test_accept(self):
vertices = [Point(0, 0, 0), Point(0, 1, 0), Point(1, 0, 0)]
building = Building(Point(0, 0, 0), vertices)
generator_mock = mock.Mock()
calls = [mock.call.start_building(building), mock.call.end_building(building)]
building.accept(generator_mock)
generator_mock.assert_has_calls(calls)
