def test_subtraction_negative_numbers(self):
num1 = -3
num2 = -3
result = math.subtraction(num1, num2)
self.assertEquals(result, 0, "Is expected to have a result equal to 0.")
def test_subtraction_mix_numbers(self):
num1 = 10
num2 = -3
result = math.subtraction(num1, num2)
self.assertEquals(result, 13, "Is expected to have a result equal to 13.")
def test_subtraction_positive_numbers(self):
num1 = 12
num2 = 3
result = math.subtraction(num1, num2)
self.assertEquals(result, 9, "Is expected to have a result equal to 9.")