busybox/shell/ash_test/ash-misc/last_amp.tests

$THIS_SH -c 'echo 3&'
d=`date`
while test "`date`" = "$d"; do true; done
d1=`date`
$THIS_SH -c 'sleep 1&'
d2=`date`
test "$d1" = "$d2" || echo BAD
echo End