How to test custom Async::DNS::Server classes?

[postmodern]

How does one test a custom class which inherits from Async::DNS::Server and defines a process method which receives the query, resource_class, and transaction.

  class Server < Async::DNS::Server
    def process(query,resource_class,transaction)
      # do stuff with transaction
    end
  end

[postmodern]

I ended up using mocks and stubbing to test the transaction object. Not ideal, but it at least found some bugs.