before_setup

# File actioncable/lib/action_cable/test_helper.rb, line 6
    def before_setup # :nodoc:
      server = ActionCable.server
      test_adapter = ActionCable::SubscriptionAdapter::Test.new(server)

      @old_pubsub_adapter = server.pubsub

      server.instance_variable_set(:@pubsub, test_adapter)
      super
    end