def test_division_of_2_by_0(self):
first_number = 2
second_number = 0
calculator = Calculator("comum")
self.assertEqual("Error! You can\'t divide a number by zero.",
calculator.divide(first_number, second_number))
def test_division_of_2_by_one_quarter(self):
first_number = 2
second_number = 0.25
calculator = Calculator("comum")
self.assertEqual(8, calculator.divide(first_number, second_number))