Unit testing with Data Access Layer?

I'm using Linq2Sql for my DAL layer and I have it as a seperate project. In my domain project I have a repository interface which I then implement using a custom Linq2SqlCarRepository in my DAL project, this class wraps up the generated Linq2Sql classes.

I would use the Repository Pattern outlined in the September 2009 article in Visual Studio magazine titled "Eliminate Database Dependencies in Test-Driven development". I have been using this pattern since I read the article with great success. This pattern will help to decouple your data layer and write good unit tests.

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