Unit Testing Your ApplicationController

class ApplicationControllerTest < ActiveSupport::TestCase
  context "An instance of ApplicationController" do

    setup { @controller = ApplicationController.new }

    should "return nil when there is no :user_id in session" do
      @controller.stubs(:session).returns({})
      assert_nil @controller.current_user
    end

    should "retrieve the current user when there is a :user_id in session" do
      user = Factory(:user)
      @controller.stubs(:session).returns({:user_id => user.id})

      assert_equal user, @controller.current_user
    end

    should "return nil when the :user_id in session can't be found in the database" do
      @controller.stubs(:session).returns(:user_id => 1)

      assert_nil @controller.current_user
    end

  end
end