Add tests for Bitmapset

When Who What
2025-09-22 07:57:36 Michael Paquier (michael-kun) Closed in commitfest PG19-2 with status: Committed
2025-09-22 05:35:24 Michael Paquier (michael-kun) Added michael-kun as committer
2025-09-18 13:59:02 Nathan Bossart (bossartn) Removed bossartn from committers
2025-09-05 02:00:29 Nathan Bossart (bossartn) Added bossartn as committer
2025-09-04 20:40:32 Nathan Bossart (bossartn) Added bossartn as reviewer
2025-08-19 20:01:22 Greg Burd (gregburd) Attached mail thread 7BD1ABDB-B03A-464A-9BA9-A73B55AD8A1F@getmailspring.com
2025-08-19 20:01:22 Greg Burd (gregburd) Created patch record