Improve tls13 handshake test

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index e90a352..ec37221 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -8692,7 +8692,9 @@
             -c "tls1_3 client state: 20"    \
             -c "tls1_3 client state: 11"    \
             -c "tls1_3 client state: 14"    \
-            -c "tls1_3 client state: 15"
+            -c "tls1_3 client state: 15"    \
+            -c "<= ssl_tls1_3_process_server_hello" \
+            -c "=> ssl_tls1_3_process_server_hello"
 
 requires_gnutls_tls1_3
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
@@ -8713,7 +8715,9 @@
             -c "tls1_3 client state: 20"    \
             -c "tls1_3 client state: 11"    \
             -c "tls1_3 client state: 14"    \
-            -c "tls1_3 client state: 15"
+            -c "tls1_3 client state: 15"    \
+            -c "<= ssl_tls1_3_process_server_hello" \
+            -c "=> ssl_tls1_3_process_server_hello"
 
 # Test heap memory usage after handshake
 requires_config_enabled MBEDTLS_MEMORY_DEBUG