C# 中如何进行私有(private)函数测试

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public class User   {       public string Name;       public string Id;  <br>        private string GetID()       {           return Id;       }   }   [TestClass()]   public class UserTests   {       [TestMethod()]       public void ToStringTest()       {           User user= new User();           user.Id = "10";             PrivateObject pObj = new PrivateObject(user);           var ret = (string)pObj.Invoke("GetID", null);           Assert.AreEqual("10", ret);       }   }