My methods I am accumulating for testing sinatra applications.

my_sinatra_test_methods.rb

module MySinatraTestMethods
  def self.included(other)
    other.send :include, Rack::Test::Methods
  end

  def app
    Sinatra::Application.new
  end

  def session
    current_session.rack_session
  end
end

module Rack
  module Test
    class Session
      alias old_env_for env_for
      def rack_session
        @rack_session ||= {}
      end
      def rack_session=(hash)
        @rack_session = hash
      end
      def env_for(path, env)
        old_env_for(path, env).merge({'rack.session' => rack_session})
      end
    end
  end
end