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 34065: Version 0.9.0.0
- Tested TweetQueryExecutor
- Created an UnFavourite method for Tweets in order to simplify the syntax and improve the readability. UnFavoriting required to call the Favourite method with false as a parameter.
- Updated related tests