tests/test-add

patch: be more tolerant to diffstat failures (issue 865)

Sometimes, revisions cannot be represented by a regular diff, only a git diff
would capture binary files or permission changes. diffstat cannot handle git
patches and will output "0 files changed" when fed with an empty diff. We
cannot consider the latter to be an error, unless we rewrite diffstat to handle
these correctly.

#!/bin/sh

hg init a
cd a
echo a > a
hg add -n
hg st
hg add
hg st

echo b > b
hg add -n b
hg st
hg add b
hg st
echo % should fail
hg add b
hg st

hg ci -m 0
echo % should fail
hg add a

echo aa > a
hg ci -m 1
hg up 0
echo aaa > a
hg ci -m 2

hg merge
hg st
echo % should fail
hg add a
hg st
hg ci -m merge

echo % issue683
hg rm a
hg st
echo a > a
hg add a
hg st