Question

I’m using Entity Frameworc 4.1 Code First and Moq. And I want to test database initializer. Also I have the abstract BaseUnitOfWork class which inherited from DbContext (so, for testing it should be mocked).

public abstract class BaseUnitOfWork : DbContext, IUnitOfWork
{
    ...
        public IDbSet<User> Users
        {
            get
            {
                return Set<User>();
            }
        }
    ...
}

User is simple POCO with three properties: Id, Login, Password.

And here is the code of the DbInitializer:

public class BaseDbInitializer : DropCreateDatabaseAlways<BaseUnitOfWork>
{
    protected override void Seed(BaseUnitOfWork context)
    {
        base.Seed(context);

        context.Set<User>().Add(new User { Login = "admin", Password = "1" });
        context.SaveChanges();
    }
}

I’m trying to test this initializer with the next test (NUnit is used):

[TestFixture]
public class BaseDbInitializerTests
{
    private BaseUnitOfWork _baseUnitOfWork;

    [TestFixtureSetUp]
    public void Init()
    {
        Database.SetInitializer(new BaseDbInitializer());
        _baseUnitOfWork = new Mock<BaseUnitOfWork>(Consts.ConnectionStringName).Object;
        _baseUnitOfWork.Database.Initialize(true);
    }

    [TestFixtureTearDown]
    public void CleanUp()
    {
        _baseUnitOfWork.Dispose();
        Database.Delete(Consts.ConnectionStringName);
    }

    [Test]
    public void ShouldInitializeBaseDb()
    {
        var repository = new Mock<BaseRepository<User>>(_baseUnitOfWork).Object;

        var firstUserInDb = repository.FindBy(x => x.Login == "admin" && x.Password == "1").SingleOrDefault();

        Assert.That(firstUserInDb, Is.Not.Null);
        Assert.That(firstUserInDb.Login, Is.EqualTo("admin"));
        Assert.That(firstUserInDb.Password, Is.EqualTo("1"));
    }
}

Unfortunately it seems like Seed method of the BaseDbInitializer class doesn’t execute. DB is recreating, but there is no any records, and I tried to debug this test and Seed method was executed during debug session.

Answer 1

The strategy DropCreateDatabaseAlways<BaseUnitOfWork> is looking for an exact type match of BaseUnitOfWork, not a derived type, and not Mock<BaseUnitOfWork>. If you need it, you’ll have to implement a copy of the strategy for the mocked type.