def test_strip_Nones(): x = [None, None] assert Policy.strip_Nones(x) == [] x = [1, 2, None] assert Policy.strip_Nones(x) == [1, 2] x = [[1, 2, 3], [4, None, None]] assert Policy.strip_Nones(x) == [[1, 2, 3], [4, -1, -1]]