admin_panel_controller_spec.rb

require 'rails_helper'

describe Admin::PanelController do
  describe "GET index" do
    context "user has access" do
      it "allows access to admin panel" do
        set_user_session("admin")

        get :index

        expect(response.status).to render_template(:index)
      end
    end

    context "user does not have access" do
      it "redirects him to login page" do
        set_user_session("user")

        get :index

        expect(response).to redirect_to login_path
      end
    end
  end

  def set_user_session(access_level)
    ben = build_stubbed(:user, access_level: access_level)
    session[:user_id] = ben.id
    expect(User).to receive(:find).and_return(ben)
  end
end