testsuite/unexpand/unexpand-works-like-GNU

# coreutils 8.25 often says "input line is too long"
# on ELF executables. In this case, do not run the test:
unexpand ../../busybox >/dev/null || exit 0

rm -f foo bar
echo "       y" | unexpand ../../busybox > foo
echo "       y" | busybox unexpand ../../busybox > bar
set +e
test ! -f foo -a -f bar
if [ $? = 0 ] ; then
	set -e
	diff -q foo bar
fi
rm -f foo bar
echo "        y" | unexpand ../../busybox > foo
echo "        y" | busybox unexpand ../../busybox > bar
set +e
test ! -f foo -a -f bar
if [ $? = 0 ] ; then
	set -e
	diff -q foo bar
fi
echo "       y       y" | unexpand ../../busybox > foo
echo "       y       y" | busybox unexpand ../../busybox > bar
set +e
test ! -f foo -a -f bar
if [ $? = 0 ] ; then
	set -e
	diff -q foo bar
fi
rm -f foo bar
echo "        y        y" | unexpand ../../busybox > foo
echo "        y        y" | busybox unexpand ../../busybox > bar
set +e
test ! -f foo -a -f bar
if [ $? = 0 ] ; then
	set -e
	diff -q foo bar
fi
echo "       y       y" | unexpand -a ../../busybox > foo
echo "       y       y" | busybox unexpand -a ../../busybox > bar
set +e
test ! -f foo -a -f bar
if [ $? = 0 ] ; then
	set -e
	diff -q foo bar
fi
rm -f foo bar
echo "        y        y" | unexpand -a ../../busybox > foo
echo "        y        y" | busybox unexpand -a ../../busybox > bar
set +e
test ! -f foo -a -f bar
if [ $? = 0 ] ; then
	set -e
	diff -q foo bar
fi