Can it be done without using TypeMock Islolator? I've found a few suggestions online such as passing in a metadata only connection string, however nothing I've come across besides TypeMock seems to truly allow for a mock ObjectContext that can be injected into services for unit testing. Do I plunk down the $$ for TypeMock, or are there alternatives? Has nobody managed to create anything comparable to TypeMock that is open source?
I'm unit testing EF4 easily without mocking. What I did was create a repository interface using the code from http://elegantcode.com/2009/12/15/entity-framework-ef4-generic-repository-and-unit-of-work-prototype/ as a basis I then created an
InMemoryRepository<T> class that used the
IRepository interface. I then replaced the
IObjectSet<T> with a
List<T> inside of the class and changed the retrieval methods accordingly.
Thus if you need to do unit testing, pass in the InMemoryRepository rather than the DataRepository.
Put your Linq2Entity query behind an interface, unit test it in isolation against a real database.
Write tests for your business logic with mocks for your query interfaces. Don't let Linq bleed into your business logic!
Don't use the RepositoryPattern!