FEATURE: Site setting to display user avatars in user menu (#24514)

spec/requests/users_controller_spec.rb

@@ -7051,6 +7051,18 @@ RSpec.describe UsersController do
         expect(notifications.size).to eq(1)
         expect(notifications.first["data"]["bookmark_id"]).to eq(bookmark_with_reminder.id)
       end
+
+      context "with `show_user_menu_avatars` setting enabled" do
+        before { SiteSetting.show_user_menu_avatars = true }
+
+        it "serializes acting_user_avatar into notifications" do
+          get "/u/#{user.username}/user-menu-bookmarks"
+          expect(response.status).to eq(200)
+
+          first_notification = response.parsed_body["notifications"].first
+          expect(first_notification["acting_user_avatar_template"]).to be_present
+        end
+      end
     end
   end