def test_append_curve():
curve = Curve([(1, 2, 3, 4), (5, 6, 7, 8)])
sub_curve = Curve([(10, 20), (30, 40)])
curve1 = curve.append(sub_curve)
assert curve1 == Curve([(1, 2, 3, 4, 10, 20), (5, 6, 7, 8, 30, 40)])
def test_append_point():
curve = Curve([(1, 2, 3, 4), (5, 6, 7, 8)])
point = Point([10, 20])
curve1 = curve.append(point)
assert curve1 == Curve([(1, 2, 3, 4, 10), (5, 6, 7, 8, 20)])