http://msmvps.com/blogs/matthieu/archive/2009/05/25/ef4-poco-my-tests.aspxI published an unit tests project to show how POCO works with EF4 . I also wrote a BetaBugs test class in order to illustrate the POCO implementation Beta bugs.enCommunityServer 2008.5 SP2 (Build: 40407.4157)