ObjectContext never derives from an interface?? How do you apply DI/IoC in case of multiple types of ObjectContext?

Question

If you have a system that has multiple types of object contexts. For Eg: BillingObjectContext, HumanResourceObjectContext etc. All derive from ObjectContext but ObjectContex

Answer 1

If you must depend on it in a test, you have to mock it. Here's a sample; it's not much harder than implementing an interface. See also TDD improvements in EF 4.