13.x
[12.x] Fix embedded image Content-ID inconsistency in cloned emails (#57726)
[9.x] Add ability to determine if attachments exist (#43967)
Move Testbench-based tests to tests/Integration (#61080)
[11.x] Test Improvements (#55549)
Centralize per-test static state resets in AfterEachTestSubscriber (#61078)
[10.x] Test Improvements for Mail & Notifications tests (#50690)
[13.x] Reset fake time globally after each test, drop redundant Carbon::setTestNow() cleanup (#60761)
Fix test compatibility with PHP 8.5 (#59251)
Use Carbon::now() and Date::now() instead of now() helper (#59252)