Added routing in test for actionpack

Do not merge this right now.

The helper test is failing. I think we have a bug here.


```ruby
 1) Failure:
ActionDispatch::Routing::HelperTest#test_exception [/Users/arunagw/checkouts/rails/actionpack/test/routing/helper_test.rb:25]:
ActionController::RoutingError expected but nothing was raised.
```