[io] test for renaming with unversioned classes

[ferdymercury]

This Pull request:

Changes or fixes:

Test for #14491
Closes #14491

Checklist:

• tested changes locally
• updated the docs (if necessary)

[github-actions]

Test Results

    23 files      23 suites   3d 5h 51m 23s ⏱️
 3 837 tests  3 835 ✅ 0 💤 2 ❌
71 609 runs  71 598 ✅ 8 💤 3 ❌

For more details on these failures, see this check.

Results for commit c7df9fe.

♻️ This comment has been updated with latest results.

[linev]

Instead providing root file I would add writedata.C macro and execute it.
So one can clearly see that kind of data is produced.

[ferdymercury]

Instead providing root file I would add writedata.C macro and execute it.
So one can clearly see that kind of data is produced.

Thanks, good idea. Could you verify that I set the FIXTURES flag correctly? Since I am not used to those yet.

[linev]

Fixtures configured correctly.
I let @pcanal approve PR.

[ferdymercury]

It seems it only fails on Windows. No idea why...

[linev]

It seems it only fails on Windows. No idea why...

Looks like difference in file content.
May be some variables not initialized when file is created.

[ferdymercury]

@bellenot do you have by chance an educated guess of what could be failing in Windows? such as an integer type having different widths on each platform or so.

[bellenot]

@ferdymercury I don't see anything obvious, but I'll check...
The test output & diff is:

  -- BEGIN TEST OUTPUT --
  
  Processing C:/ROOT-CI/src/roottest/root/io/evolution/versions/ROOT14491readdata.cxx+...
  ***********************************
  *    Row   * Instance * seg_split *
  ***********************************
  dups 0
  copy 0
  dups 1
  copy 1
  *        0 *        0 *         0 *
  ***********************************
  dups 0
  copy 0
  dups 1
  copy 1
  ***********************************
  *    Row   * Instance * seg_unspl *
  ***********************************
  dups 0
  copy 0
  dups 1
  copy 2
  dups 0
  copy 0
  dups 1
  copy 3
  *        0 *        0 *         0 *
  ***********************************
  (int) 0
  
  -- END TEST OUTPUT --
  -- BEGIN OUTDIFF OUTPUT --
  --- C:/ROOT-CI/src/roottest/root/io/evolution/versions/ROOT14491readdata.ref	Mon Dec  8 12:12:20 2025
  +++ C:/ROOT-CI/build/roottest/root/io/evolution/versions/ROOT14491readdata.log	Mon Dec  8 13:54:41 2025
  @@ -23,6 +23,6 @@
   copy 0
   dups 1
   copy 3
  -*        0 *        0 *         1 *
  +*        0 *        0 *         0 *
   ***********************************
   (int) 0
  
  -- END OUTDIFF OUTPUT --

So maybe @pcanal has an idea, before I start debugging...