Speccing the creation of a singleton resource

Hey guys. I’m writing a Rails gem that’s used by controllers. The gem
creates a singleton resource at run-time, along the lines of:

controller_name = …dynamically generated…

ActionController::Routing::Routes.draw do |map|
map.resource controller_name, :only => :show

I’m trying to figure out how to spec the creation of the singleton
resource. The best that I’ve come up with so far is checking that a
route exists:

== controller_name.to_s

However, that doesn’t test whether or not it’s a singleton resource.

Any suggestions? Thanks,