JustMock with BLL - unit-testing

Question

I am using JustMock and I am having difficulty having JustMock work with Entity Framework and mocking the database activity - specifically a fake insert
I want to do a fake insert and then return the fake inserted entity. I want to test that the password is hashed before insert (handled by the BLL).
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();
}
Here are my tests...
//This works
[Test]
[ExpectedException(ExpectedMessage = "Email account already exists")]
public void Create_NoDupeEmails()
{
List<User> fakeUsers = new List<User>();
fakeUsers.Add(new User { EmailAddress = "peter#email.com", FirstName = "Peter", LastName = "Griffin" });
fakeUsers.Add(new User { EmailAddress = "lois#email.com", FirstName = "Lois", LastName = "Griffin" });
//arrange
var context = Mock.Create<MyDatabaseEntities>();
Mock.Arrange(() => context.Users).ReturnsCollection(fakeUsers);
//act
var bll = new UserBLL(context);
bll.Create("peter#email.com", "password");
//Assert
//handled by the expected exception
}
Failing test
[Test]
public void Create_PasswordHashed()
{
var context = Mock.Create<MyDatabaseEntities>();
//arrange
Mock.Arrange(() => context.SaveChanges()).MustBeCalled();
var bll = new UserBLL(context);
bll.Create("test#email.com", "password");
User user = bll.GetUser("test#email.com");
//user is null?
Assert.IsTrue(user != null); //it fails here
Assert.IsTrue(user.Password != "password");
}
What am I doing wrong?

Answer 1

So I figured it out after looking at some samples across the web. The BLL remains the same, but here is the test
Once failing - now passing test
[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("test#email.com", "password");
Assert.IsTrue(users.Count == 1);
Assert.IsTrue(!string.IsNullOrWhiteSpace(users[0].Password));
Assert.IsTrue(users[0].Password != "password");
}