def div_zero(self):
calculator = Calculator()
result = calculator.divide(1, 0)
expected_result = None
assert result == expected_result
def test_divide(self, a, b, expected_result):
calculator = Calculator()
result = calculator.divide(a, b)
assert_almost_equal(result, expected_result, 6)
def test_capsys(self, capsys):
calculator = Calculator()
calculator.divide(2, 0)
div_zero_message = "div_by_0\n"
out, err = capsys.readouterr()
assert div_zero_message == out