user_spec.rb

      params = {:username => "ohai",
                :email => "ohai@example.com",
                :password => "password",
                :password_confirmation => "password",
                :captcha => "12345",

                :person =>
                  {:profile =>
                    {:first_name => "O",
                     :last_name => "Hai"}
                  }
      }
      @user = User.build(params)
    end

    it "saves with captcha off" do
      AppConfig.settings.captcha.enable = false
      expect(@user).to receive(:save).and_return(true)
      @user.sign_up
    end

    it "saves with captcha on" do
      AppConfig.settings.captcha.enable = true
      expect(@user).to receive(:save_with_captcha).and_return(true)
      @user.sign_up
    end
  end
end