public void IsAncestorOrEqual()
{
var dirA = new ContentPath("a");
var itemB = dirA.CatDir("b");
Assert.True(dirA.IsAncestorOrSelf(itemB));
Assert.True(dirA.IsAncestorOrSelf(dirA));
Assert.False(itemB.IsAncestorOrSelf(dirA));
}