#!/bin/sh
export REDO_MD5SUM="openssl md5 -r"

echo 1 > 'b b'
redo-ifchange 'a a'
read a1 < 'a a'

echo 2 > 'b b'
redo-ifchange 'a a'
read a2 < 'a a'

: >> 'b b'
redo-ifchange 'a a'
read a3 < 'a a'

echo 3 > 'b b'

if [ $a1 -ge $a2 ]; then
  echo 'FAIL: a1 >= a2' >&2
else
  echo 'PASS: a1 < a2' >&2
fi

if [ $a2 != $a3 ]; then
  echo 'FAIL: a2 != a3' >&2
else
  echo 'PASS: a2 = a3' >&2
fi