How to test a Controller Concern in Rails 4

Question

What is the best way to handle testing of concerns when used in Rails 4 controllers? Say I have a trivial concern Citations.

module Citations
    ex         


        

Answer 1

Simplifying on method 2 from the most voted answer.

I prefer the anonymous controller supported in rspec http://www.relishapp.com/rspec/rspec-rails/docs/controller-specs/anonymous-controller

You will do:

describe ApplicationController, type: :controller do
  controller do
    include MyControllerConcern

    def index; end
  end

  describe 'GET index' do
    it 'will work' do
      get :index
    end
  end
end

Note that you need to describe the ApplicationController and set the type in case this does not happen by default.