public void Add_2_3_Return_5()
        {
            // Act
            var result = _controller.Add(2, 3);

            // Assert
            Assert.Equal("5", result.Value);
        }
        public void adding_two_numbers_together_should_return_correct_amount_when_called()
        {
            // Arrange
            int firstNumber  = 3;
            int secondNumber = 4;
            var expected     = 7;

            // Act
            var actual = _calculator.Add(firstNumber, secondNumber);

            // Assert
            Assert.AreEqual(expected, actual);
        }