-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
+expect_code "$EXIT_FAILURE" tinc foo -n foo get somethingreallyunknown
+expect_code "$EXIT_FAILURE" tinc foo --net
+expect_code "$EXIT_FAILURE" tinc foo --net get name
+expect_code "$EXIT_FAILURE" tinc foo foo