Make tests work on Solaris: - replacement for mktemp - fall back if shell arithmetic doesn't work - replacement for 'set -x' (which results look different with some shells) - "FOO=bar; export FOO" instead of "export FOO=bar" - don't use 'if ! ...'

#!/bin/sh

mkdir a
cd a
hg init
echo 123 > a
hg add a
hg commit -m "a" -u a -d "0 0"

cd ..
mkdir b
cd b
hg init 
echo 321 > b
hg add b
hg commit -m "b" -u b -d "0 0"

hg pull ../a
hg heads