gistfile1.txt

//第三版
    public class Target
    {
        public delegate int MyDelegate();

        private MyDelegate _myDelegate = new DelegateSource().DelegateOne;
        public int MyMethod(int original)
        {            
            var mod = _myDelegate();
            return original % mod;
        }
    }


    public class DelegateSource
    {

        public int DelegateOne()
        {
            var result = GetMyValue();
            return result;
        }

        private int GetMyValue()
        {
            return 2;
        }
    }

//測試
        /// <summary>
        ///MyMethod 的測試
        ///</summary>
        [TestMethod()]
        public void MyMethodTest_mockPrivateDelegate()
        {
            Target_Accessor target = new Target_Accessor();
            //assign private的_myDelegate，則會走mock object function
            target._myDelegate = () => { return 5; };
            int original = 7;
            int expected = 2;
            int actual;

            //7%5=2;
            actual = target.MyMethod(original);
            Assert.AreEqual(expected, actual);
        }

        /// <summary>
        ///MyMethod 的測試
        ///</summary>
        [TestMethod()]
        public void MyMethodTest_WithDelegateSource()
        {
            Target_Accessor target = new Target_Accessor();
            //不assign private的_myDelegate，則會走原本的new DelegateSource().DelegateOne
            //target._myDelegate = () => { return 5; };

            int original = 7;
            int expected = 1;
            int actual;

            //7%2=1;
            actual = target.MyMethod(original);
            Assert.AreEqual(expected, actual);
        }