private void ClearAndReset()
{
_collectionIndex.Clear();
ClearWeakEventHandlers();
_collectionToNode.Clear();
_sourceToCollectionNode.Clear();
RecordCurrentValues(_collectionIndex.TopLeft, this.Source);
FireReset();
}
public void Clear_Always_RemovesAll()
{
CreateThreeLevelTree(1);
var originalBottomLeft = _target.BottomLeft;
_target.Clear();
var newBottomLeft = _target.BottomLeft;
Assert.AreSame(originalBottomLeft, _target.BottomLeft);
Assert.AreSame(originalBottomLeft, _target.TopLeft);
Assert.IsNull(_target.TopLeft.Below);
Assert.IsNull(_target.TopLeft.Above);
Assert.IsNull(_target.TopLeft.Next);
Assert.IsNull(_target.TopLeft.Previous);
Assert.AreEqual(_target.TopLeft.ItemsInNode, 0);
}