app_controller_spec.rb

require 'spec_helper'

describe 'AppController', :type => :feature do

  include GameHelpers

  before :each do
    def session # Creates new rack mock session object
      MockSession.new(rack_mock_session.cookie_jar) # (from mixin) Creates rack mock session object, Assigns new session to Cookie Jar object
    end
  end

  describe '#get_game' do
    before :each do
      session[:player_one_type] = 'human'
      session[:player_two_type] = 'computer'
      session[:board_size] = 3
      session[:current_board] = {"1A"=>nil, "2A"=>'X', "3A"=>nil,
                                 "1B"=>nil, "2B"=>nil, "3B"=>nil,
                                 "1C"=>nil, "2C"=>nil, "3C"=>nil}
    end

    it 'returns a WebGame object' do
      get_game.is_a?(WebGame)
    end
 ...
  end
...
end