While running tests for other issues, I discovered one failing test on

MySQL 5.7 with Django 4.1. The issue here is just one of test

expectations-- It turns out that Django 4.1 introduced a check for

supports_index_column_ordering in Index.create_sql(), which omits

DESC when the database doesn't support it (such as MySQL 5.7). Older

Django versions always emitted DESC regardless.
The test expectation now accounts for this by only omitting DESC on

Django 4.1+ when the feature is unsupported.

Ran tests against all combinations of Django+MySQL.