https://www.drupal.org/node/3248295
Taxonomy tests should not rely on Classy [#3248295] | Drupal.org
Apr 29, 2022 - Problem/Motivation Because of [#3083275] and Classy being deprecated in Drupal 9 + removed in Drupal 10,: Tests that aren't specifically testing Classy yet...
should notrely ontaxonomytestsclassy