This site uses the
django-wm library for Django and is built to help developers test their implementation of that library. However, the site should also be useful for testing any other implementation of the Webmention spec!
To test your outgoing webmentions, create a post that includes a link to this page. If it works, your h-card should appear below after a few moments.
To test your incoming webmentions, submit a link to a mentionable page on your site. It will appear (for ~15 minutes) on this page and notify your server's webmention endpoint so you can make sure it's handled correctly.