public IEnumerator CreateClip()
{
PlayableDirector director = CreateDirectorWithTimelineAsset(TIMELINE_ASSET_PATH, out TimelineAsset timelineAsset);
yield return(YieldEditorUtility.WaitForFramesAndIncrementUndo(1));
TimelineClip clip = TimelineEditorUtility.CreateTrackAndClip <DummyTimelineTrack, DummyTimelinePlayableAsset>(
timelineAsset, "FirstTrack");
VerifyClip(clip);
TimelineEditorUtility.SelectDirectorInTimelineWindow(director); //trigger the TimelineWindow's update etc.
yield return(YieldEditorUtility.WaitForFramesAndIncrementUndo(3));
DummyTimelineClipData clipData = clip.GetClipData <DummyTimelineClipData>();
Assert.IsNotNull(clipData);
TimelineEditorUtility.DestroyAssets(clip); //Cleanup
}