[3.1.0.rc5] Failing routing for all tests in basic app generation

Hi, I'm trying to generate a mountable engine and have done the following:

rails plugin new foo --mountable cd foo rails generate scaffold bar name:string rake test

This results in errors for every test such as this:

  4) Error: test_should_get_index(Foo::BarsControllerTest): NoMethodError: undefined method `bars' for #<Foo::BarsControllerTest: 0x91f44c>     actionpack (3.1.0.rc5) lib/action_dispatch/testing/assertions/ routing.rb:175:in `method_missing'     /foo/test/functional/foo/bars_controller_test.rb:6:in `_callback_before_35'     activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:440:in `_run_setup_callbacks'     activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:81:in `send'     activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:81:in `run_callbacks'     activesupport (3.1.0.rc5) lib/active_support/testing/ setup_and_teardown.rb:65:in `run'

Ironically, running 'rails server' and going to 'http://localhost:3000/ foo/bars' shows that the engine and all the routing is working perfectly. But all tests choke on not being able to find 'bars_path' or the like.

I'm having a similar problem, I'm upgrading an engine to 3.1 and all my routing specs are red.

Is there a way to debug/print out the generated engine routes? When running rake routes from my dummy app I can't see the expanded routes, all I see is mything / {:to=>MyThing::Engine}.

Anything new here? What should one do? The tests look allright...