async def test_decrementing_calls_refresh_of_surrounding_light_curve_loading(
self):
preloader = Preloader()
preloader.next_view_entity_deque = MagicMock()
preloader.previous_view_entity_deque = MagicMock()
preloader.current_view_entity = Mock()
mock_refresh_surrounding_light_curve_loading = AsyncMock()
preloader.refresh_surrounding_light_curve_loading = mock_refresh_surrounding_light_curve_loading
_ = await preloader.decrement()
assert mock_refresh_surrounding_light_curve_loading.called
async def test_decrementing_preloader_shifts_light_curve_deques(self):
preloader = Preloader()
preloader.current_view_entity = Mock(index=1)
preloader.previous_view_entity_deque = deque([Mock(index=0)])
preloader.next_view_entity_deque = deque([Mock(index=2)])
preloader.refresh_surrounding_light_curve_loading = AsyncMock()
new_current = await preloader.decrement()
assert new_current.index == 0
assert len(preloader.next_view_entity_deque) == 2
assert preloader.next_view_entity_deque[0].index == 1
assert len(preloader.previous_view_entity_deque) == 0