tests/test-undo

Inherit config from real parentui and don't use ConfigParser internals.
Added comments for the meaning of parentui.

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "0 0"
hg verify
hg parents
hg status
hg undo
hg verify
hg parents
hg status