gistfile1.rb

# system_controller.rb
class Admin::SystemController < Admin::AdminController
  
  def edit
    @system = System.find(params[:id])
  end
  
end

# system_controller_test.rb
require File.dirname(__FILE__) + '/../../test_helper'

class Admin::SystemControllerTest < ActionController::TestCase
  setup :fake_login
  
  context "GET to :edit" do
    setup { get :edit }
    should_render_template :edit
    should_assign_to :system
    should_respond_with :success
  end
end