Minitest - test controller concerns - ruby-on-rails

Question

I try to test my controller concerns using minitest-rails and combining this techniques:
http://ridingtheclutch.com/post/55701769414/testing-controller-concerns-in-rails.
Anonymous controller in Minitest w/ Rails
And i get "no route matches error":
ActionController::UrlGenerationError: No route matches {:action=>"index", :controller=>"fake"}
require "test_helper"
require "warden_mock"
class FakeController < ApplicationController
attr_accessor :request
def initialize(method_name=nil, &method_body)
include MyConcern # method redirect_to_404 placed here
#request = OpenStruct.new # mockup request
#request.env = {}
#request.env['warden'] = WardenMock.new # mockup warden
if method_name and block_given? # dynamically define action for concern methods testing
self.class.send(:define_method, method_name, method_body)
test_routes = Proc.new do
resources :fake
end
Rails.application.routes.eval_block(test_routes)
end
end
end
describe FakeController do # just very simple test
context "just redirect_to_404" do
it "it must redirect to /404" do
#controller = FakeController.new(:index) { redirect_to_404 }
get :index
assert_redirected_to '/404'
end
end
end
I have rails 4.1.5 and minitest 5.4.0

Answer 1

Probably too late for the OP, but I've done it in this way:
require 'test_helper'
class SolrSearchParamsFakeController < ApplicationController
include SolrSearchParams # this is my controller's concern to test
def index
# The concern modify some of the parameters, so I'm saving them in a
# variable for future test inspection, so YMMV here.
#params = params
render nothing: true
end
end
Rails.application.routes.draw do
# Adding a route to the fake controller manually
get 'index' => 'solr_search_params_fake#index'
end
class SolrSearchParamsFakeControllerTest < ActionController::TestCase
def test_index
get :index, search: 'asdf wert'
# finally checking if the parameters were modified as I expect
params = assigns(:params)
assert_equal params[:original_search], 'asdf wert'
end
end
Update
Sorry, but actually this is messing up all my tests that involve route access in some way, as with Rails.application.routes.draw I'm rewriting all the routes for tests and leaving just that solr_search_params_fake#index route.
Not sure how to add instead of rewriting.... a fix would be adding directly to config/routes.rb my test routes with an if Rails.env.test? condition? (yeah, it's a crappy solution, but I'll leave this here in case someone find a better way to do this).