def test_partial_finalize():
pipeline = [discard_evens, finalize(7), square, finalize(9), None, to_str]
assert list(flow(range(10), pipeline)) == ["1", "9", "25", "7", "81"]
def test_communication_from_later_to_earlier_pipes():
pipelines = [square, discard_remainder, None, locate(9)]
assert list(flow(range(10), pipelines)) == [0, 1, 4, 9]
def test_flow():
pipeline = [discard_evens, finalize(7), square, finalize(9), to_str]
assert list(flow(range(10), pipeline)) == ["1", 9, "25", 7, "81"]
