- test_item.cpp: 3 tests for Item class
- test_timelineview.cpp: 3 tests for TimelineView class
- test_timelinewidget.cpp: 3 tests for TimelineWidget class
- test_timelineindicator.cpp: 3 tests for TimelineIndicator class
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>