Unit testing with EF4 “Code First” and Repository

Question

I am attempting to get a handle on Unit testing a very simple ASP.NET MVC test app I\'ve built using the Code First approach in the latest EF4 CTP. I\'m not very experience

Answer 1

You probably getting an error

 AutoFixture was unable to create an instance from System.Data.Entity.DbSet`1[...], most likely because it has no public constructor, is an abstract or non-public type.

The DbSet has a protected constructor.

The approach usually taken to support testability create your own implementation of the Db Set

public class MyDbSet : IDbSet where T : class
{

Use this as

public class MyContext : DbContext
{
    public virtual MyDbSet Prices { get; set; }
}

If you look at the below SO question, 2ns answer, you should be able to find the complete implementation of a custom DbSet.

Unit testing with EF4 "Code First" and Repository

Then the

 var priceService = fixture.Create();

Should not throw an exception.