connection.rb

    def connection
      @connection ||= Faraday::Connection.new(:url => @uri.to_s) do |conn|
        conn.use      Faraday::Request::ActiveSupportJson
        conn.adapter  Faraday.default_adapter
        conn.use      Tinder::FaradayResponse::RaiseOnAuthenticationFailure
        conn.use      Faraday::Response::ActiveSupportJson
        conn.use      Tinder::FaradayResponse::WithIndifferentAccess

        conn.headers['Content-Type'] = 'application/json'
        conn.proxy ENV['HTTP_PROXY']
      end
    end

test.rb

      @campfire.connection.connection.build do |conn|
        conn.use      Faraday::Request::ActiveSupportJson
        conn.adapter :test do |stub|
          stub.get('/rooms.json') {[ 200, {}, fixture('rooms.json') ]}
        end
        conn.use      Tinder::FaradayResponse::RaiseOnAuthenticationFailure
        conn.use      Faraday::Response::ActiveSupportJson
        conn.use      Tinder::FaradayResponse::WithIndifferentAccess
      end