def test_discard_only_removes_one_element(a): t = TopoSet(a) sizes = [len(t)] for item in a: t.discard(item) sizes.append(len(t)) assert all(a == b + 1 for a, b in pairwise(sizes))
def test_discarding_all_elements_results_in_an_empty_set(a): t = TopoSet(a) for item in a: t.discard(item) assert len(t) == 0
def test_discarding_an_item_not_present_silently_succeeds(a): b = max(a) + 1 t = TopoSet(a) t.discard(b)