Update tests for #9704, named route collisions

* Fix named route collision in mount test fixture
* Update controller named route precedence test

actionpack/test/controller/routing_test.rb

@@ -908,12 +908,13 @@ def test_named_draw
     assert_equal set.routes.first, set.named_routes[:hello]
   end
 
-  def test_earlier_named_routes_take_precedence
-    set.draw do
-      get '/hello/world' => 'a#b', :as => 'hello'
-      get '/hello'       => 'a#b', :as => 'hello'
+  def test_duplicate_named_route_raises_rather_than_pick_precedence
+    assert_raise ArgumentError do
+      set.draw do
+        get '/hello/world' => 'a#b', :as => 'hello'
+        get '/hello'       => 'a#b', :as => 'hello'
+      end
     end
-    assert_equal set.routes.first, set.named_routes[:hello]
   end
 
   def setup_named_route_test

actionpack/test/dispatch/mount_test.rb

@@ -21,7 +21,7 @@ def self.call(env)
     mount SprocketsApp, :at => "/sprockets"
     mount SprocketsApp => "/shorthand"
 
-    mount FakeEngine, :at => "/fakeengine"
+    mount FakeEngine, :at => "/fakeengine", :as => :fake
     mount FakeEngine, :at => "/getfake", :via => :get
 
     scope "/its_a" do