public void TypeTreeLookups()
{
var tree = new TypeTree<int>();
tree.Set<Shape>(1);
tree.Set<Circle>(11);
tree.Set<Para>(3);
tree.Set<Isosceles>(9);
tree.Set<Polygon>(6);
tree.Set<IRegular>(15);
tree.Set<IEssential>(20);
Expect.Some(1, tree.Get<Shape>());
Expect.Some(6, tree.Get<Quad>());
Expect.Some(1, tree.Get<Ellipse>());
Expect.Some(11, tree.Get<Circle>());
Expect.None(tree.Get<Object>());
Expect.None(tree.Get<String>());
Expect.Some(3, tree.Get<Rhombus>());
Expect.Some(9, tree.Get<Equilateral>());
}