def test_segment_difference():
s1 = Segment([[0, 10], [20, 30], [50, 100]])
s2 = Segment([[4, 6], [15, 25], [40, 200]])
s1.difference(s2)
np.testing.assert_equal(
s1._data,
np.array([[0, 4], [6, 10], [15, 20], [25, 30], [40, 50], [100, 200]]))
def test_segment_difference_2():
s1 = Segment([[0, 10], [20, 30], [50, 100]])
s2 = Segment([[4, 6], [15, 25], [40, 200]])
s3 = Segment([[8, 20], [35, 60], [150, 180]])
nose.tools.assert_equal(s1 ^ s2 ^ s3, s1.difference(s2, s3))
