tests/test-empty-file

allow update to switch to a different branch if the repo is clean

#!/bin/sh

hg init a
cd a
touch empty1
hg add empty1
hg commit -m 'add empty1' -d '1000000 0'

touch empty2
hg add empty2
hg commit -m 'add empty2' -d '1000000 0'

hg up -C 0
touch empty3
hg add empty3
hg commit -m 'add empty3' -d '1000000 0'

hg heads

hg merge 1
# before changeset 05257fd28591, we didn't notice the 
# empty file that came from rev 1.
hg status
hg commit -m merge -d '1000000 0'
hg manifest tip