🇦🇺Australia @craigra

I've tested the patch in #11 on Drupal 10.2 and confirmed that this fixes the issue with test classes being unable to find a helper class under tests/src/Helper within a module test directory, as described in the steps to reproduce. Similarly I've verified this for theme and profile test directories.

What additional work is needed for core test locations (#7), and could this be split to another issue so the existing fix for modules, themes and profiles can be RTBC?