ITS#9309 test rejection of redundant ppolicy config

tests/scripts/test022-ppolicy

@@ -60,6 +60,21 @@ fi
 
 echo /dev/null > $TESTOUT
 
+echo "Testing redundant ppolicy instance..."
+$LDAPADD -D cn=config -H $URI1 -y $CONFIGPWF <<EOF >> $TESTOUT 2>&1
+dn: olcOverlay=ppolicy,olcDatabase={1}$BACKEND,cn=config
+objectClass: olcOverlayConfig
+objectClass: olcPPolicyConfig
+olcOverlay: ppolicy
+olcPPolicyDefault: cn=duplicate policy,ou=policies,dc=example,dc=com
+EOF
+RC=$?
+if test $RC = 0 ; then
+	echo "ldapadd should have failed ($RC)!"
+	test $KILLSERVERS != no && kill -HUP $KILLPIDS
+	exit $RC
+fi
+
 echo "Using ldapadd to populate the database..."
 # may need "-e relax" for draft 09, but not yet.
 $LDAPADD -D "$MANAGERDN" -h $LOCALHOST -p $PORT1 -w $PASSWD < \