Add comprehensive headless tests for 10 controls with enhanced ItemsSource and method testing (#18)
* Initial plan
* Add comprehensive tests for 5 controls: Avatar, Clock, ClockTicks, AspectRatioLayout, AspectRatioLayoutItem
Co-authored-by: rabbitism <14807942+rabbitism@users.noreply.github.com>
* Complete comprehensive headless tests for all 10 controls - added 72 more tests
Co-authored-by: rabbitism <14807942+rabbitism@users.noreply.github.com>
* Add requested test cases for MultiComboBox and TreeComboBox - ItemsSource, Remove, Clear, hierarchical data
Co-authored-by: rabbitism <14807942+rabbitism@users.noreply.github.com>
* test: open dropdown to trigger materialization.
* test: set CurrentCulture to en-US for calendar view tests
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rabbitism <14807942+rabbitism@users.noreply.github.com>
Co-authored-by: rabbitism <dongbin@irihi.tech>
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