import pytest from manim.utils.iterables import list_difference_update, list_update  def test_list_difference_update_removes_matching_items():    assert list_difference_update([1, 2, 3, 4], [2, 4]) == [1, 3]  def test_list_difference_update_preserves_duplicates_and_order():    assert list_difference_update([3, 1, 3, 2, 1], [1]) == [3, 3, 2]  @pytest.mark.parametrize(    ("l1", "l2", "expected"),    [([1, 2, 3, 4], [2, 4], [1, 3]), ([], [1, 2], [])],)def test_list_difference_update_removes_elements(l1, l2, expected):    assert list_difference_update(l1, l2) == expected  def test_list_difference_update_preserves_l1_order_and_duplicates():    assert list_difference_update([3, 1, 3, 2, 1], [1]) == [3, 3, 2]  @pytest.mark.parametrize(    ("l1", "l2", "expected"),    [([1, 2, 3], [2, 4], [1, 3, 2, 4]), ([], [1, 2], [1, 2])],)def test_list_update_removes_overlap_and_appends_l2(l1, l2, expected):    assert list_update(l1, l2) == expected  def test_list_update_preserves_duplicates_in_l2():    assert list_update([1, 2, 3], [2, 4, 4]) == [1, 3, 2, 4, 4]