Commented Task: Add Test Cases for All the current methods that does not [1785]

Possibility to Mock<IToken> to get the results we expect instead of directly performing the queries.
Comments: Associated with changeset 33490: Version 0.9.0.0
- Changed all List into IEnumerable because developers does not need to know which type of list it is, neither should they need to update it at any point.
- Storing collection though are still List so that developers can play with those!
- Starting tests of FriendshipController