unit test servlet with access to session

I have a RemoteServiceServlet that I'd like to test independently from
my client code, however it needs access to an HttpSession object for a
great many of the methods. I've thought of a few methods that seem a
little hackish: I could refactor most of the logic into
@VisibleForTesting methods that take the session attributes as
parameters, or I could re-implement the interface in another class and
delegate to it from the servlet. What are the best practices here?

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