2 files changed, 12 insertions, 4 deletions
diff --git a/actionpack/test/lib/controller/fake_controllers.rb b/actionpack/test/lib/controller/fake_controllers.rb
index 1a2863b689..e985716f43 100644
--- a/actionpack/test/lib/controller/fake_controllers.rb
+++ b/actionpack/test/lib/controller/fake_controllers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ContentController < ActionController::Base; end
 
 module Admin
diff --git a/actionpack/test/lib/controller/fake_models.rb b/actionpack/test/lib/controller/fake_models.rb
index ce9522d12a..01c7ec26ae 100644
--- a/actionpack/test/lib/controller/fake_models.rb
+++ b/actionpack/test/lib/controller/fake_models.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require "active_model"
 
-class Customer < Struct.new(:name, :id)
+Customer = Struct.new(:name, :id) do
   extend ActiveModel::Naming
   include ActiveModel::Conversion
 
   undef_method :to_json
 
-  def to_xml(options={})
+  def to_xml(options = {})
     if options[:builder]
       options[:builder].name name
     else
@@ -14,7 +16,7 @@ class Customer < Struct.new(:name, :id)
     end
   end
 
-  def to_js(options={})
+  def to_js(options = {})
     "name: #{name.inspect}"
   end
   alias :to_text :to_js
@@ -26,9 +28,13 @@ class Customer < Struct.new(:name, :id)
   def persisted?
     id.present?
   end
+
+  def cache_key
+    "#{name}/#{id}"
+  end
 end
 
-class Post < Struct.new(:title, :author_name, :body, :secret, :persisted, :written_on, :cost)
+Post = Struct.new(:title, :author_name, :body, :secret, :persisted, :written_on, :cost) do
   extend ActiveModel::Naming
   include ActiveModel::Conversion
   extend ActiveModel::Translation