def test_calculator_multiply_is_zero():
calt = Calculator()
num1 = 3
num2 = 1
expected = 0
with pytest.raises(Exception):
assert calt.multiply(num1, num2)
def test_calculator_add_is_zero():
calt = Calculator()
num1 = 0
num2 = 1
expected = 0
assert calt.multiply(num1, num2) == expected
