def test_internal_diagonals_4():
cseg = Contour([1, 0, 4, 3, 2])
n = 2
assert cseg.internal_diagonals(n) == [1, 1, -1]
def test_internal_diagonals_2():
cseg = Contour([0, 2, 3, 1])
n = 2
assert cseg.internal_diagonals(n) == [1, -1]
