public void SiblingsFromRoot()
{
var startNode = _tree[1];
var result = HierarchyWalker.Siblings(startNode, n => n.Parent, n => n.Children);
Assert.True(!result.Any());
}
public void Siblings()
{
var startNode = _tree[1213];
var expectedNodes = new[] { 1211, 1212, 1214, 1215 };
var result = HierarchyWalker.Siblings(startNode, n => n.Parent, n => n.Children);
var resultNodes = result.Select(n => n.NodeId).ToList();
Assert.True(expectedNodes.Length == resultNodes.Count);
Assert.True(expectedNodes.All(node => resultNodes.Contains(node)));
}