diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 280fc6348..b349512cc 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -357,9 +357,11 @@ detect_dtls() {
 # Options:  -s pattern  pattern that must be present in server output
 #           -c pattern  pattern that must be present in client output
 #           -u pattern  lines after pattern must be unique in client output
+#           -f call shell function on client output
 #           -S pattern  pattern that must be absent in server output
 #           -C pattern  pattern that must be absent in client output
 #           -U pattern  lines after pattern must be unique in server output
+#           -F call shell function on server output
 run_test() {
     NAME="$1"
     shift 1
@@ -546,6 +548,18 @@ run_test() {
                     return
                 fi
                 ;;
+            "-F")
+                if ! $2 "$SRV_OUT"; then
+                    fail "function call to '$2' failed on Server output"
+                    return
+                fi
+                ;;
+            "-f")
+                if ! $2 "$CLI_OUT"; then
+                    fail "function call to '$2' failed on Client output"
+                    return
+                fi
+                ;;
 
             *)
                 echo "Unknown test: $1" >&2