public void Given_Subtraction_Operation_Positive_and_Negative_number_are_Run()
 {
     GivenSubtractionOperation.Operate(3, -3).Should().Be(6);
 }
 public void Given_Subtraction_Operation_Two_Positive_number_are_Run()
 {
     GivenSubtractionOperation.Operate(2, 2).Should().Be(0);
 }
 public void Given_Subtraction_Operation_Two_Negative_number_are_Run()
 {
     GivenSubtractionOperation.Operate(-2, -7).Should().Be(5);
 }