Unit testing method in service layer?

Wrap the ObjectContext class in a wrapperclass -- let's call it ContextWrapper for fun -- that only exposes what you need from it. Then you can inject an interface of this (IContextWrapper) in to your class with your method. A wrapper can be mocked with no hooks attached to the outside world.

The treestructure, as you say, is easy to create, and get from your mock object. Thus making your test TRUE unittests instead of a kind of integration test.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.