[test-serialize] Assert len

src/test-serialize.cc

@@ -44,7 +44,7 @@ main (int argc, char **argv)
   s.end_serialize ();
 
   hb_bytes_t bytes = s.copy_bytes ();
-  printf ("serialized %u bytes\n", bytes.length);
+  assert (bytes.length == 10);
   bytes.fini ();
 
   return 0;