Include routes.mounted_helpers into integration tests

In integration tests, you might want to use helpers from engines that
you mounted in your application. It's not hard to add it by yourself,
but it's unneeded boilerplate. mounted_helpers are now included by
default. That means that given engine mounted like:

    mount Foo::Engine => "/foo", :as => "foo"

you will be able to use paths from this engine in tests this way:

    foo.root_path #=> "/foo"

(closes #6573)

1 files changed, 1 insertions, 1 deletions

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index e43e897783..25d099d83e 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -1327,7 +1327,7 @@ module ActionDispatch
             msg += @draw_paths.map { |_path| " * #{_path}" }.join("\n")
             raise ArgumentError, msg
           end
-          
+
           route_path = "#{path}/#{name}.rb"
           instance_eval(File.read(route_path), route_path.to_s)
         end