このルートでマウント可能なエンジンを作成しました:
Rails.application.routes.draw do
  scope module: :minimalist_cms do
    root to: "pages#show"
    get ':id', to: "pages#show"
    resources :pages
    resources :page_parts
  end
end
そして、私はこのテストを持っています:
require 'spec_helper'
module MinimalistCms
  describe PagesController, type: :controller do
    let(:page) { stub_model(Page) }
    describe :show do
      context "when there is a page" do
        it 'should find by slug' do
          Page.should_receive(:find_by_slug).and_return(page)
          get :show, id: 'test'
        end
      end
    end
  end
end
入力すると、次のrake routes結果が得られます。
          root        /                              minimalist_cms/pages#show
               GET    /:id(.:format)                 minimalist_cms/pages#show
         pages GET    /pages(.:format)               minimalist_cms/pages#index
               POST   /pages(.:format)               minimalist_cms/pages#create
      new_page GET    /pages/new(.:format)           minimalist_cms/pages#new
     edit_page GET    /pages/:id/edit(.:format)      minimalist_cms/pages#edit
          page GET    /pages/:id(.:format)           minimalist_cms/pages#show
               PUT    /pages/:id(.:format)           minimalist_cms/pages#update
               DELETE /pages/:id(.:format)           minimalist_cms/pages#destroy
    page_parts GET    /page_parts(.:format)          minimalist_cms/page_parts#index
               POST   /page_parts(.:format)          minimalist_cms/page_parts#create
 new_page_part GET    /page_parts/new(.:format)      minimalist_cms/page_parts#new
edit_page_part GET    /page_parts/:id/edit(.:format) minimalist_cms/page_parts#edit
     page_part GET    /page_parts/:id(.:format)      minimalist_cms/page_parts#show
               PUT    /page_parts/:id(.:format)      minimalist_cms/page_parts#update
               DELETE /page_parts/:id(.:format)      minimalist_cms/page_parts#destroy
それは機能しますが、これを変更すると、私のエンジンで:
MinimalistCms::Engine.routes.draw do
  scope module: :minimalist_cms do
    root to: "pages#show"
    get ':id', to: "pages#show"
    resources :pages
    resources :page_parts
  end
end
そして私のアプリケーションでは:
次のように私のダミーアプリケーションにマウントされました:
Dummy::Application.routes.draw do
  mount MinimalistCms::Engine, at: '/'
end
私はこのエラーがあります:
 Failure/Error: get :show, id: 'test'
 ActionController::RoutingError:
   No route matches {:id=>"test", :controller=>"minimalist_cms/pages", :action=>"show"}
そしてrake routes結果は似ているようです:
    minimalist        /                              MinimalistCms::Engine
          root        /                              minimalist_cms/pages#show
               GET    /:id(.:format)                 minimalist_cms/pages#show
         pages GET    /pages(.:format)               minimalist_cms/pages#index
               POST   /pages(.:format)               minimalist_cms/pages#create
      new_page GET    /pages/new(.:format)           minimalist_cms/pages#new
     edit_page GET    /pages/:id/edit(.:format)      minimalist_cms/pages#edit
          page GET    /pages/:id(.:format)           minimalist_cms/pages#show
               PUT    /pages/:id(.:format)           minimalist_cms/pages#update
               DELETE /pages/:id(.:format)           minimalist_cms/pages#destroy
    page_parts GET    /page_parts(.:format)          minimalist_cms/page_parts#index
               POST   /page_parts(.:format)          minimalist_cms/page_parts#create
 new_page_part GET    /page_parts/new(.:format)      minimalist_cms/page_parts#new
edit_page_part GET    /page_parts/:id/edit(.:format) minimalist_cms/page_parts#edit
     page_part GET    /page_parts/:id(.:format)      minimalist_cms/page_parts#show
               PUT    /page_parts/:id(.:format)      minimalist_cms/page_parts#update
               DELETE /page_parts/:id(.:format)      minimalist_cms/page_parts#destroy
アプリケーションの動作は変更されず、機能しますが、テストは失敗します。
解決策はありますか?