Fix test-notify for systems without or with a different version of diffstat. Some diffstat versions say "1 file changed", others "1 files changed".

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 3
kill -HUP $P
wait
ls .hg