tests/README

dirstate: report bad subdirectories as match.bad, not just a warning (BC)

This seems simpler and more correct.

The only test coverage for this is test-permissions.t when it says:
  dir: Permission denied

To run the tests, do:

cd tests/
python run-tests.py

See http://mercurial.selenic.com/wiki/WritingTests for
more information on writing tests.