def test_overload_sub():
x = DualNumber(5,2)
y = DualNumber(7,1)
assert (x - y).val == -2 and (x - y).der == 1
assert (x.__rsub__(y)).val == 2 and (x.__rsub__(y)).der == -1
assert (x - 5).val == 0 and (x - 5).der == 2
assert (x - 5.0).val == 0 and (x - 5.0).der == 2
assert (5 - x).val == 0 and (5 - x).der == -2
assert (5.0 - x).val == 0 and (5.0 - x).der == -2
def rm_test_overload_sub():
x = DualNumber(5,Reverse=True)
y = DualNumber(7,Reverse=True)
assert (x - y).val == -2 and (x - y).der == 0
assert (x.__rsub__(y)).val == 2 and (x.__rsub__(y)).der == 0
assert (x - 5).val == 0 and (x - 5).der == 0
assert (x - 5.0).val == 0 and (x - 5.0).der == 0
assert (5 - x).val == 0 and (5 - x).der == 0
assert (5.0 - x).val == 0 and (5.0 - x).der == 0
