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 _on_event_box_size_allocate(self, event_box, allocation):
    if self._is_event_box_allocated_size:
      return