3 files changed, 20 insertions, 19 deletions
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index 46de36317e..6584d20840 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -251,7 +251,6 @@ end
 
 module ActionController
   class Base
-    include ActionController::Testing
     # This stub emulates the Railtie including the URL helpers from a Rails application
     include SharedTestRoutes.url_helpers
     include SharedTestRoutes.mounted_helpers
diff --git a/actionpack/test/controller/params_wrapper_test.rb b/actionpack/test/controller/params_wrapper_test.rb
index 11ccb6cf3b..645ecae220 100644
--- a/actionpack/test/controller/params_wrapper_test.rb
+++ b/actionpack/test/controller/params_wrapper_test.rb
@@ -337,14 +337,26 @@ class IrregularInflectionParamsWrapperTest < ActionController::TestCase
   tests ParamswrappernewsController
 
   def test_uses_model_attribute_names_with_irregular_inflection
-    ActiveSupport::Inflector.inflections do |inflect|
-      inflect.irregular 'paramswrappernews_item', 'paramswrappernews'
-    end
+    with_dup do
+      ActiveSupport::Inflector.inflections do |inflect|
+        inflect.irregular 'paramswrappernews_item', 'paramswrappernews'
+      end
 
-    with_default_wrapper_options do
-      @request.env['CONTENT_TYPE'] = 'application/json'
-      post :parse, { 'username' => 'sikachu', 'test_attr' => 'test_value' }
-      assert_parameters({ 'username' => 'sikachu', 'test_attr' => 'test_value', 'paramswrappernews_item' => { 'test_attr' => 'test_value' }})
+      with_default_wrapper_options do
+        @request.env['CONTENT_TYPE'] = 'application/json'
+        post :parse, { 'username' => 'sikachu', 'test_attr' => 'test_value' }
+        assert_parameters({ 'username' => 'sikachu', 'test_attr' => 'test_value', 'paramswrappernews_item' => { 'test_attr' => 'test_value' }})
+      end
     end
   end
+
+  private
+
+  def with_dup
+    original = ActiveSupport::Inflector::Inflections.instance_variable_get(:@__instance__)[:en]
+    ActiveSupport::Inflector::Inflections.instance_variable_set(:@__instance__, en: original.dup)
+    yield
+  ensure
+    ActiveSupport::Inflector::Inflections.instance_variable_set(:@__instance__, en: original)
+  end
 end
diff --git a/actionpack/test/journey/router_test.rb b/actionpack/test/journey/router_test.rb
index 1a2106a3c5..f298808be8 100644
--- a/actionpack/test/journey/router_test.rb
+++ b/actionpack/test/journey/router_test.rb
@@ -4,18 +4,10 @@ require 'abstract_unit'
 module ActionDispatch
   module Journey
     class TestRouter < ActiveSupport::TestCase
-      # TODO : clean up routing tests so we don't need this hack
-      class StubDispatcher < Routing::RouteSet::Dispatcher
-        def initialize
-          super({})
-        end
-        def dispatcher?; true; end
-      end
-
       attr_reader :routes
 
       def setup
-        @app       = StubDispatcher.new
+        @app       = Routing::RouteSet::Dispatcher.new({})
         @routes    = Routes.new
         @router    = Router.new(@routes)
         @formatter = Formatter.new(@routes)
@@ -566,8 +558,6 @@ module ActionDispatch
         end
       end
 
-      RailsEnv = Struct.new(:env)
-
       def rails_env env, klass = ActionDispatch::Request
         klass.new env
       end