Map a column to be IDENTITY in db

Although I have marked my ID column with .Identity(), the generated database schema doesn't have IDENTITY set to true, which gives me problems when I'm adding records. If I manually edit the database schema (in SQL Management Studio) to have the Id column marked IDENTITY, everything works as I want it - I just can't make EF do that by itself.

This is my complete mapping:

public class EntryConfiguration : EntityConfiguration<Entry>
{
    public EntryConfiguration()
    {
        Property(e => e.Id).IsIdentity();
        Property(e => e.Amount);
        Property(e => e.Description).IsRequired();
        Property(e => e.TransactionDate);

        Relationship(e => (ICollection<Tag>)e.Tags).FromProperty(t => t.Entries);
    }
}

As I'm using EF to build and re-build the database for integration testing, I really need this to be done automatically...

EDIT: Hm... In a comment I was requested to give enough code to execute this, so I cut-and-pasted my code into a cons开发者_高级运维ole app (so you wouldn't need all my classes...) and suddenly it just worked. I guess I was forgetting some method call somewhere, although I haven't been able to figure out where.

I'll post the working solution code in an answer to this post, in case someone else comes looking for it.

Running this code solves the problem. I guess I must have forgot a step somewhere, so if you have the same problem, make sure you do all these things:

var connection = GetUnOpenedSqlConnection();       // Any connection that inherits
                                                   // from DbConnection is fine.

var builder = new ContextBuilder<ObjectContext>(); // I actually had my own class
                                                   // that inherits from 
                                                   // ObjectContext, but that was 
                                                   // not the issue (I checked).

builder.Configurations.Add(EntryConfiguration);    // EntryConfiguration is the 
                                                   // class in the question

var context = builder.Create(connection);

if (context.DatabaseExists())
{ context.DeleteDatabase(); }

context.CreateDatabase();