public void RepositoryCalledWhenSaveMessageInvoked()
{
var message = "Message";
var username = "******";
var inputstring = string.Format("{0}:{1}", username, message);
var userMessage = new UserMessage(username, message);
subject = new MessagePoster(mockRespository.Object);
subject.SaveMessage(inputstring);
mockRespository.Verify(x => x.Save(It.IsAny <UserMessage>()), Times.Once);
}