def test_invert_linear(self):
s = Span(5, 15, 20, False)
s1, s2 = s.invert()
assert s1.a == 0
assert s1.b == 5
assert s2.a == 15
assert s2.b == 20
def test_invert_wrapped(self):
s = Span(5, 15, 10, True)
s1, s2 = s.invert()
assert len(s1) == 0
assert s2 is None
def test_invert_cyclic(self):
s = Span(5, 15, 20, True)
i1 = s.invert()[0]
assert i1.a == 15
assert i1.b == 5
def test_invert(self):
s = Span(0, 1000, 1000, cyclic=True)
assert s.contains_pos(1)
s2 = s.invert()
assert len(s2[0]) == 0