Added testing output

src/goodbyedpi.c

@@ -578,6 +578,7 @@ static void send_native_fragment(HANDLE w_filter, WINDIVERT_ADDRESS addr,
 
 int main(int argc, char *argv[]) {
     debugPrint = &printf;
+    debug("Testing debug output");
     static enum packet_type_e {
         unknown,
         ipv4_tcp, ipv4_tcp_data, ipv4_udp_data,