Multiple Rails engine rspec controller test not work - ruby-on-rails

Question

I have multiple Rails engines in my Rails 4 beta1 application. I'm installed rspec-rails gem to every engines. And I created my engine following command:
rails plugin new store_frontend --dummy-path=spec/dummy -d postgresql --skip-test-unit --mountable
In my engine's dummy application I configured database and routes. Here is example routes.rb file:
Rails.application.routes.draw do
mount StoreFrontend::Engine => "/store"
end
When I run rspec inside first engine I get following errors:
1) StoreAdmin::DashboardController GET 'index' returns http success
Failure/Error: get 'index'
ActionController::UrlGenerationError:
No route matches {:action=>"index", :controller=>"store_admin/dashboard"}
# ./spec/controllers/store_admin/dashboard_controller_spec.rb:8:in `block (3 levels) in <module:StoreAdmin>'
And here is my controller test /It's generated from Rails/:
require 'spec_helper'
module StoreFrontend
describe HomeController do
describe "GET 'index'" do
it "returns http success" do
get 'index'
response.should be_success
end
end
end
end
It seems like controller test is not working. I have model tests and it's working fine. Any idea?
UPDATE 1:
My application structure:
bin/
config/
db/
lib/
log/
public/
tmp/
engine1/
engine2/
engine3/

Answer 1

The solution is very simple. Add use_route to your controller test. Here is the example.
module StoreFrontend
describe HomeController do
describe "GET 'index'" do
it "returns http success" do
get 'index', use_route: 'store_frontend' # in my case
response.should be_success
end
end
end
end

Answer 2

The configuration and spec you show are for StoreFrontend but the error is for StoreAdmin::DashboardController. So it seems like you are just confused about which engine you are testing and/or which engine is failing.
Of course the simple solution is to create the missing route {:action=>"index", :controller=>"store_admin/dashboard"}

Answer 3

In order to get the routing correct when testing Rails engine controllers with Rspec, I typically add the following code to my spec_helper.rb:
RSpec.configure do |config|
config.before(:each, :type => :controller) { #routes = YourEngineName::Engine.routes }
config.before(:each, :type => :routing) { #routes = YourEngineName::Engine.routes }
end