Small change in routing for execution creation

* config/routes.rb: POST /plans/:plan_id/cases/:test_case_id/executions,
the only difference here is the use of /cases in the url instead of
/test_cases, just to match the use of /cases elsewhere.
* spec/routing/executions_routing_spec.rb: added a routing test for
this.

jaribio/config/routes.rb

@@ -28,7 +28,7 @@
       get 'open'
     end
 
-    resources :test_cases, :only => [] do
+    resources :test_cases, :path => '/cases', :only => [] do
       resources :executions, :only => [:create]
     end
   end

jaribio/spec/routing/executions_routing_spec.rb

@@ -7,5 +7,8 @@
       get("/executions/1").should route_to("executions#show", :id => "1")
     end
 
+    it "routes to #create" do
+      post("/plans/1/cases/1/executions").should route_to("executions#create", :plan_id => "1", :test_case_id => "1")
+    end
   end
 end