Measure changed-key work on large collections

test/test_codegen.ml

@@ -659,7 +659,11 @@ let generated_differential_case seed_count batch_count =
               let updates_path = Filename.concat dir (Printf.sprintf "updates_%d.sexp" seed) in
               write_entries input_path entries;
               write_batches updates_path batches;
-              (match run [ executable; "--input"; input_path; "--updates"; updates_path; "--trace"; "--print-result" ] with
+              (match run
+                  [
+                    executable; "--input"; input_path; "--updates"; updates_path; "--trace";
+                    "--verify"; "--print-result";
+                  ] with
               | Unix.WEXITED 0, output ->
                   let lines = List.filter (fun line -> line <> "") (String.split_on_char '\n' output) in
                   if List.length lines <> List.length expected then