EF4 - possible to mock ObjectContext for unit testing?
entity-framework, mocking, objectcontext, typemock
Solution
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.
Problem
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?