public void Summation_AllArraysNot123InAnyOrder_ReturnArraySum(int[] values, int expected)
        {
            // Arrange
            var ios11Calculator = new Ios11Calculator();

            // Act
            var result = ios11Calculator.Summation(values);

            // Assert
            result.Should().Be(expected);
        }
        public void Summation_123InAnyOrder_Return24(int[] values)
        {
            // Arrange
            var ios11Calculator = new Ios11Calculator();

            // Act
            var result = ios11Calculator.Summation(values);

            // Assert
            result.Should().Be(24, "Because the iOS11 Calculator is wrong.");
        }