Rails: How to modify tests for a nested resource?

While learning Rails I've created an application with a Domains controller nested below a Customers controller. I'm using Rails 2.3.4 and it's been a learning experience. I managed to get the below routing set up:

    customer_domains GET    /customers/:customer_id/domains(.:format)          {:controller=>"domains", :action=>"index"}
                     POST   /customers/:customer_id/domains(.:format)          {:controller=>"domains", :action=>"create"}
 new_customer_domain GET    /customers/:customer_id/domains/new(.:format)      {:controller=>"domains", :action=>"new"}
edit_customer_domain GET    /customers/:customer_id/domains/:id/edit(.:format) {:controller=>"domains", :action=>"edit"}
     customer_domain GET    /customers/:customer_id/domains/:id(.:format)      {:controller=>"domains", :action=>"show"}
                     PUT    /customers/:customer_id/domains/:id(.:format)      {:controller=>"domains", :action=>"update"}
                     DELETE /customers/:customer_id/domains/:id(.:format)      {:controller=>"domains", :action=>"destroy"}
           customers GET    /customers(.:format)                               {:controller=>"customers", :action=>"index"}
                     POST   /customers(.:format)                               {:controller=>"customers", :action=>"create"}
        new_customer GET    /customers/new(.:format)                           {:controller=>"customers", :action=>"new"}
       edit_customer GET    /customers/:id/edit(.:format)                      {:controller=>"customers", :action=>"edit"}
            customer GET    /customers/:id(.:format)                           {:controller=>"customers", :action=>"show"}
                     PUT    /customers/:id(.:format)                           {:controller=>"customers", :action=>"update"}
                     DELETE /customers/:id(.:format)