def test_bool(self):
        prio_set_list = event._PrioritizedSetList()

        assert bool(prio_set_list) is False

        prio_set_list.add(0, None)
        assert bool(prio_set_list) is True
def draw_path(self,c,container):
		c.path(self.center[0],self.center[1],container.center[0],container.center[1])