Hello Richard Szalay,

first of all, thank you very much for this very helpfull library. One thing I have found on using it - if you use expectations with multithreaded application, then the queue requestExpectations in MockHttpMessageHandler.cs (line 16) sometimes becomes negative valued, because it is not thread safe. Maybe its a good idea to use your lock object to lock the queue or to use the ConcurrentQueue.

Thank you very much