public void TestFactorialWhenInput1_Returns1()
        {
            //arrange
            int input    = 1;
            int expected = 1;

            //act
            int output = MyMethods.Factorial(input);

            //assert
            Assert.AreEqual(expected, output);
        }
        public void TestFactorial()
        {
            //arrange
            int input    = 5;
            int expected = 120;

            //act
            int output = MyMethods.Factorial(input);

            //assert
            Assert.AreEqual(expected, output);
        }