@webmentionrocks: who tests the test suite itself? This guy.
Verified target/endpoint mismatch returns an error (but does not disqualify test in progress).
Manually sent four webmentions for:
* Update of post target reply to (link 1)
* Update of post target link 1, endpoint 2: Rejected.
* Update of post target link 2, endpoint 1: Rejected.
* Update of post target link 2, endpoint 2: Test passed.
And then another to update this comment.