Rails: how to test and access custom routing - ruby-on-rails

Question

so far in routes.rb
match 'campaigns_mobile_application', to: 'campaigns#update_mobile_store_application', via: [:post, :get]
in spec_helper.rb
config.include Rails.application.routes.url_helpers
in controller_spec.rb
get campaigns_mobile_application_path format: :json # and here I have error
ok, I have error:
ActionController::RoutingError No route matches {:controller=>"campaigns", :action=>"/api/campaigns_mobile_application.json"}
change routes.rb now:
resources :campaigns do
match 'mobile_application', to: 'campaigns#update_mobile_store_application', via: [:post, :get]
end
and also spec:
get campaign_mobile_application_path campaign_id: #campaign.id, format: :json
and again I catch error:
ActionController::RoutingError:
No route matches {:controller=>"campaigns", :action=>"/api/campaigns/6775/mobile_application.json"}
How to fix this?
UPD:
I try different magic with on: :member, on: :collection, as: :name and other stuff.
Seems that I completely doesn't understand routing.
routes.rb
resources :campaigns do
match :mobile_applications, to: 'campaigns#update_mobile_store_applications',
via: [:post, :get], on: :member, as: :mobile_applications
end
**rake routes **
mobile_applications_campaign POST|GET /api/campaigns/:id/mobile_applications(.:format) campaigns#update_mobile_store_applications
controller.rb
def update_mobile_store_applications
render: json: { }, status: :ok
end
spec.rb
get mobile_applications_campaign_path campaign_id: #campaign.id, format: :json
generate error:
Failure/Error: get mobile_applications_campaign_path campaign_id: #campaign.id, format: :json
ActionController::RoutingError:
No route matches {:action=>"update_mobile_store_applications", :controller=>"campaigns", :campaign_id=>8059, :format=>:json}
change request to this one (rename parameter):
get mobile_applications_campaign_path id: #campaign.id, format: :json
still generate error: ( different error )
Failure/Error: get mobile_applications_campaign_path id: #campaign.id, format: :json
ActionController::RoutingError:
No route matches {:controller=>"campaigns", :action=>"/api/campaigns/8108/mobile_applications.json"}
UPD2
This code works well on app but not in testing.
UPD3
This code works well on testing too now! Yeah!
get :update_mobile_store_applications, id: #campaign.id, format: :json

Answer 1

get :mobile_applications_campaign_path, id: #campaign.id, format: :json
The format was incorrect look here: https://github.com/everydayrails/rails-4-1-rspec-3-0/blob/master/spec/controllers/contacts_controller_spec.rb
This code is part of a Everyday Rails Testing book, a very good book for learn testing with rspec on Rails