def test_extrude():
removed = Segment(2, 5)
timeline = Timeline(uri='KINGJU')
timeline.add(Segment(0, 3))
timeline.add(Segment(2, 5))
timeline.add(Segment(6, 7))
expected_answer = Timeline()
expected_answer.add(Segment(0, 2))
expected_answer.add(Segment(6, 7))
assert timeline.extrude(removed, mode='intersection') == expected_answer
expected_answer = Timeline(uri="MCSALO")
expected_answer.add(Segment(0, 3))
expected_answer.add(Segment(6, 7))
assert timeline.extrude(removed, mode='strict') == expected_answer
expected_answer = Timeline(uri="CADILLAC")
expected_answer.add(Segment(6, 7))
assert timeline.extrude(removed, mode='loose') == expected_answer
