Improve dispatch tests

Test base on return value is not good enough.

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 39499d4..41e714e 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -8660,11 +8660,11 @@
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
 run_test    "TLS1.3: handshake dispatch test: tls1_3 only" \
-            "$P_SRV min_version=tls1_3 max_version=tls1_3" \
-            "$P_CLI min_version=tls1_3 max_version=tls1_3" \
+            "$P_SRV debug_level=2 min_version=tls1_3 max_version=tls1_3" \
+            "$P_CLI debug_level=2 min_version=tls1_3 max_version=tls1_3" \
             1 \
-            -s "SSL - The requested feature is not available" \
-            -c "SSL - The requested feature is not available"
+            -s "tls13 server state: MBEDTLS_SSL_HELLO_REQUEST" \
+            -c "tls13 client state: MBEDTLS_SSL_HELLO_REQUEST"
 
 requires_openssl_tls1_3
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL