Update CertificateRequest tests and the parsing function

Signed-off-by: Xiaofei Bai <xiaofei.bai@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 0fabae9..3babab8 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -9194,6 +9194,7 @@
             "$P_CLI debug_level=4 force_version=tls13 " \
             1 \
             -c "=> parse certificate request" \
+            -c "got a certificate request" \
             -c "<= parse certificate request"
 
 requires_gnutls_tls1_3
@@ -9208,6 +9209,7 @@
             "$P_CLI debug_level=3 min_version=tls13 max_version=tls13" \
             1 \
             -c "=> parse certificate request" \
+            -c "got a certificate request" \
             -c "<= parse certificate request"
 
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3