单元测试——用BLL进行模拟

Question

我正在使用JustMock，我很难让JustMock与实体框架一起工作并模拟数据库活动-特别是假插入

我想做一个假插入，然后返回假插入的实体。我想测试密码在插入(由BLL处理)之前是散列的。

UserBLL

 public UserBLL(MyDatabaseEntities context)
        : base(context)
 {            
 }
 public void Create(string email, string password)
 {      
    //check and make sure that the email does not already exist
    User user = GetUser(email);
    if (user != null)
       throw new Exception("Email account already exists");
    string salt = GetSalt();
    var hashedPassword = HashPassword(password, salt);
    var newUser = new User()
    {
       EmailAddress = email,
       Password = hashedPassword            
    };
    context.Users.Add(newUser);
    context.SaveChanges();
}

这是我的测试…

    //This works
    [Test]
    [ExpectedException(ExpectedMessage = "Email account already exists")]
    public void Create_NoDupeEmails()
    {
        List<User> fakeUsers = new List<User>();
        fakeUsers.Add(new User { EmailAddress = "[e-mail]", FirstName = "Peter", LastName = "Griffin" });
        fakeUsers.Add(new User { EmailAddress = "[e-mail]", FirstName = "Lois", LastName = "Griffin" });
        //arrange
        var context = Mock.Create<MyDatabaseEntities>();
        Mock.Arrange(() => context.Users).ReturnsCollection(fakeUsers);
        //act
        var bll = new UserBLL(context);
        bll.Create("[e-mail]", "password");
        //Assert
        //handled by the expected exception
    }

失败的测试

 [Test]
  public void Create_PasswordHashed()
 {      
   var context = Mock.Create<MyDatabaseEntities>();    
   //arrange
   Mock.Arrange(() => context.SaveChanges()).MustBeCalled();
   var bll = new UserBLL(context);
   bll.Create("[e-mail]", "password");
   User user = bll.GetUser("[e-mail]");
   //user is null?
   Assert.IsTrue(user != null);    //it fails here
   Assert.IsTrue(user.Password != "password");
 }

我做错了什么?

Answer 1

所以我在网上看了一些样本后就明白了。BLL保持不变，但这里是测试

一次失败-现在通过测试

 [Test]
    public void Create_PasswordHashed()
    {
        //arrange
        var context = Mock.Create<MyDatabaseEntities>();
        var users = new List<User>();
        Mock.Arrange(() => context.Users.Add(Arg.IsAny<User>()))
            .DoInstead((User u) => users.Add(u));   //this will add the "user u" to the list of "users"
        var bll = new UserBLL(context);
        bll.Create("[e-mail]", "password");

        Assert.IsTrue(users.Count == 1);
        Assert.IsTrue(!string.IsNullOrWhiteSpace(users[0].Password));
        Assert.IsTrue(users[0].Password != "password");
    }