using System.Collections.Generic;
 using System.Linq;
 using Microsoft.VisualStudio.TestTools.UnitTesting;

 namespace TestingDemo.Tests {

     [TestClass]
     public class AdminControllerTests {

         [TestMethod]
         public void CanChangeLoginName() {

             // Arrange (set up a scenario)
             User user = new User() { LoginName = "Bob" };
             FakeRepository repositoryParam = new FakeRepository();
             repositoryParam.Add(user);
             AdminController target = new AdminController(repositoryParam);
             string oldLoginParam = user.LoginName;
             string newLoginParam = "Joe";

             // Act (attempt the operation)
             target.ChangeLoginName(oldLoginParam, newLoginParam);

             // Assert (verify the result)
             Assert.AreEqual(newLoginParam, user.LoginName);
             Assert.IsTrue(repositoryParam.DidSubmitChanges);
         }
     }
     /// <summary>
     /// 模仿接口的实现
     /// </summary>
     class FakeRepository : IUserRepository {
         public List<User> Users = new List<User>();
         public bool DidSubmitChanges = false;

         public void Add(User user) {
             Users.Add(user);
         }

         public User FetchByLoginName(string loginName) {
             return Users.First(m => m.LoginName == loginName);
         }

         public void SubmitChanges() {
             DidSubmitChanges = true;
         }
     }
 }