@param querying: A L{Deferred} returned from one of the DNS client
            I{lookup} methods.

        @param expectedRecords: A L{list} of L{IRecord} providers which must be
            in the response or the test will be failed.

        @return: A L{Deferred} that fires when the assertion has been made.  It
            fires with a success result if the assertion succeeds and with a
            L{Failure} if it fails.
        c