Extending routes in tests. How to define extra routing in your tests.

application_controller.rb

class ApplicationController < ActionController::Base
  def logged_in?
    session[:user_id].present?
  end
  
  def require_login
    unless logged_in?
      session[:requested_path] = url_for(only_path: true)
      
      redirect_to new_authentication_path
    end
  end
end

application_controller_spec.rb

class AuthorizationController < ApplicationController
  before_action :require_login
end

Rails.application.routes.tap do |routes|
  routes.disable_clear_and_finalize = true
  
  routes.draw do
    resources :authorization, only: :index
  end
end

describe '#require_login' do
  controller AuthorizationController do
    def index
      render nothing: true
    end
  end
  
  before do
    allow(subject).to receive(:logged_in?).and_return(logged_in)
  end
  
  context 'not logged in' do
    let(:logged_in) { false }
    
    it 'should be redirect' do
      get :index
      
      expect(subject).to have_received(:logged_in?).with(nil)
      expect_redirect(response, new_authentication_path)
    end
  end
end