diff --git a/ssl/ssl_test.c b/ssl/ssl_test.c
index 19f7efd..68889a0 100644
--- a/ssl/ssl_test.c
+++ b/ssl/ssl_test.c
@@ -179,6 +179,11 @@
   "BOGUS",
   /* Invalid command. */
   "?BAR",
+  /* Special operators are not allowed if groups are used. */
+  "[ECDHE-RSA-CHACHA20-POLY1305|ECDHE-RSA-AES128-GCM-SHA256]:+FOO",
+  "[ECDHE-RSA-CHACHA20-POLY1305|ECDHE-RSA-AES128-GCM-SHA256]:!FOO",
+  "[ECDHE-RSA-CHACHA20-POLY1305|ECDHE-RSA-AES128-GCM-SHA256]:-FOO",
+  "[ECDHE-RSA-CHACHA20-POLY1305|ECDHE-RSA-AES128-GCM-SHA256]:@STRENGTH",
   NULL,
 };