tests/README

grep: remove useless while condition

A revised version of 35ba170c0f82 was sent to the list that fixed this
<http://markmail.org/message/jmfuiise5igcyh2m>, but the older version of
the patch was applied.

To run the tests, do:

cd tests/
python run-tests.py

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