- 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>