anchor.diff:  
       Client = ssl_test_lib:start_basic_client(openssl, 'tlsv1.3', Port, ClientOpts),
   
  -    ssl_test_lib:check_result(Server,
  -                              {error,
  -                               {tls_alert,
  -                                {certificate_required,
  -                                 "received SERVER ALERT: Fatal - Certificate required - certificate_required"}}}),
  +    ssl_test_lib:check_server_alert(Server, certificate_required),
       ssl_test_lib:close(Server),
       ssl_test_lib:close_port(Client).
   
  
positive.code: 
      Client = ssl_test_lib:start_basic_client(openssl, 'tlsv1.3', Port, ClientOpts),
  
      ssl_test_lib:check_result(Server,
                                {error,
                                 {tls_alert,
                                  {certificate_required,
                                   "received SERVER ALERT: Fatal - Certificate required - certificate_required"}}}),
      ssl_test_lib:close(Server),
      ssl_test_lib:close_port(Client).
  
  tls13_client_auth_empty_cert_ssl_server_openssl_client() ->
       [{doc,"TLS 1.3: Test client authentication when client sends an empty certificate and fail_if_no_peer_cert is set to false."}].
  
negative.code: 
      Client = ssl_test_lib:start_basic_client(openssl, 'tlsv1.3', Port, ClientOpts),
  
      ssl_test_lib:check_server_alert(Server, insufficient_security),
      ssl_test_lib:close(Server),
      ssl_test_lib:close_port(Client).
  
  