-$tinc $c1 -n foo get somethingreallyunknown && exit 1 || true
-$tinc $c1 --net && exit 1 || true
-$tinc $c1 --net get name && exit 1 || true
-$tinc $c1 foo && exit 1 || true
+must_fail tinc foo -n foo get somethingreallyunknown
+must_fail tinc foo --net
+must_fail tinc foo --net get name
+must_fail tinc foo foo