1 files changed, 7 insertions, 0 deletions
diff --git a/railties/test/application/initializers/frameworks_test.rb b/railties/test/application/initializers/frameworks_test.rb
index 6e9ceb6ef7..61340e82c3 100644
--- a/railties/test/application/initializers/frameworks_test.rb
+++ b/railties/test/application/initializers/frameworks_test.rb
@@ -65,6 +65,13 @@ module ApplicationTests
       assert_equal ["notify"], Foo.action_methods
     end
 
+    # AD
+    test "action_dispatch extensions are applied to ActionDispatch" do
+      add_to_config "config.action_dispatch.tld_length = 2"
+      require "#{app_path}/config/environment"
+      assert_equal 2, ActionDispatch::Http::URL.tld_length
+    end
+
     # AS
     test "if there's no config.active_support.bare, all of ActiveSupport is required" do
       use_frameworks []