subrepo: make update -C clean the working directory for svn subrepos This makes 'hg update --clean' behave the same way for both kinds of subrepositories. Before Subversion subrepos did not take the clean parameter into account, but just updated to the given revision and merged uncommitted changes into that.

To run the tests, do:

cd tests/
python run-tests.py

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