public void TreeTraversal_FindNextSiblingOrCousin()
{
/*
* root
* / | \
* a b c
* /|\ |
* / | \ |
* aa ab ac ca
* /|\ |\
* / | \ | \
* aba abb abc caa cab
*/
// sibling
Assert.AreEqual(a_b_c, TreeTraversal <TestTreePart> .FindNextSiblingOrCousin(a_b_b));
// cousin
Assert.AreEqual(a_c, TreeTraversal <TestTreePart> .FindNextSiblingOrCousin(a_b_c));
// cousin through root
Assert.AreEqual(b, TreeTraversal <TestTreePart> .FindNextSiblingOrCousin(a_c));
}