database setup for Unit testing Linq to Sql, where database have relationships

I google around unit testing LINQ to SQL and 开发者_运维问答people are using MockDatabase class where we have list and add data to those Lists.

This will fit in the scenarios where we dont have relationships. I am behind using some data or mdf file in the unit test project which will have the same structure as like my actual database with all relationships and LINQ-to-SQL dml statements will be thoroughly tested.

Any idea what kind of mock database can i use???