Add a test that exercice better the behavior we expect in the query cache

In production the query cache was already being loaded before the first
request even without #33856, so added a test to make sure of it.

This new test is passing even if #33856 is reverted.

railties/test/application/loading_test.rb

@@ -371,7 +371,7 @@ def test_initialize_can_be_called_at_any_time
     end
   end
 
-  test "active record query cache hooks are installed before first request" do
+  test "active record query cache hooks are installed before first request in production" do
     app_file "app/controllers/omg_controller.rb", <<-RUBY
       begin
         class OmgController < ActionController::Metal
@@ -395,7 +395,40 @@ def show
       end
     RUBY
 
-    require "#{rails_root}/config/environment"
+    boot_app "production"
+
+    require "rack/test"
+    extend Rack::Test::Methods
+
+    get "/omg/show"
+    assert_equal "Query cache is enabled.", last_response.body
+  end
+
+  test "active record query cache hooks are installed before first request in development" do
+    app_file "app/controllers/omg_controller.rb", <<-RUBY
+      begin
+        class OmgController < ActionController::Metal
+          ActiveSupport.run_load_hooks(:action_controller, self)
+          def show
+            if ActiveRecord::Base.connection.query_cache_enabled
+              self.response_body = ["Query cache is enabled."]
+            else
+              self.response_body = ["Expected ActiveRecord::Base.connection.query_cache_enabled to be true"]
+            end
+          end
+        end
+      rescue => e
+        puts "Error loading metal: \#{e.class} \#{e.message}"
+      end
+    RUBY
+
+    app_file "config/routes.rb", <<-RUBY
+      Rails.application.routes.draw do
+        get "/:controller(/:action)"
+      end
+    RUBY
+
+    boot_app "development"
 
     require "rack/test"
     extend Rack::Test::Methods
@@ -415,4 +448,12 @@ def setup_ar!
         end
       end
     end
+
+    def boot_app(env = "development")
+      ENV["RAILS_ENV"] = env
+
+      require "#{app_path}/config/environment"
+    ensure
+      ENV.delete "RAILS_ENV"
+    end
 end