Add tests for enum helper

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 5968501..d401aea 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -1663,7 +1663,9 @@
 {
     int ret = 0;
 
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 client state: %d", ssl->state ) );
+    MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 client state: %s(%d)",
+                                mbedtls_ssl_states_str( ssl->state ),
+                                ssl->state ) );
 
     switch( ssl->state )
     {
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index e9c74ca..67c0725 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -31,7 +31,9 @@
 int mbedtls_ssl_tls13_handshake_server_step( mbedtls_ssl_context *ssl )
 {
     ((void) ssl);
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 server state: %d", ssl->state ) );
+    MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 server state: %s(%d)",
+                                mbedtls_ssl_states_str( ssl->state ),
+                                ssl->state ) );
 
     return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
 }
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index d5e9e01..eadb211 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -8809,8 +8809,8 @@
             "$P_SRV debug_level=2 min_version=tls13 max_version=tls13" \
             "$P_CLI debug_level=2 min_version=tls13 max_version=tls13" \
             1 \
-            -s "tls13 server state: 0"     \
-            -c "tls13 client state: 0"
+            -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