Fix failure_app failing test.

lib/devise/mapping.rb

@@ -100,10 +100,6 @@ module Devise
       "/#{@path_prefix}/#{@path}".squeeze("/")
     end
 
-    def failure_app
-      Devise::FailureApp
-    end
-
     # Create magic predicates for verifying what module is activated by this map.
     # Example:
     #

test/integration/authenticatable_test.rb

@@ -202,9 +202,7 @@ class AuthenticationSanityTest < ActionController::IntegrationTest
   end
 
   test 'scope uses custom failure app' do
-    app = lambda { |env| [404, {"Content-Type" => "text/plain"}, ["Oops, not found"]] }
-    Devise.mappings[:admin].expects(:failure_app).returns(app)
-    get admins_path
+    put "/en/accounts/management"
     assert_equal "Oops, not found", response.body
     assert_equal 404, response.status
   end

test/rails_app/config/environments/development.rb

@@ -11,7 +11,6 @@ RailsApp::Application.configure do
 
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
-  config.action_view.debug_rjs             = true
   config.action_controller.perform_caching = false
 
   # Don't care if the mailer can't send

test/rails_app/config/routes.rb

@@ -71,7 +71,7 @@ Rails.application.routes.draw do
         :password => "secret", :confirmation => "verification",
         :unlock => "unblock", :sign_up => "register",
         :registration => "management", :cancel => "giveup"
-      }
+      }, :failure_app => lambda { |env| [404, {"Content-Type" => "text/plain"}, ["Oops, not found"]] }
   end
 
   namespace :sign_out_via, :module => "devise" do