public void TestSetAndGet()
{
var octree = new PositionOctree<string>();
octree.Insert("hello", 0, 0, 0);
_assert.Equal("hello", octree.Find(0, 0, 0));
octree.Insert("world", -1, -1, -1);
_assert.Equal("world", octree.Find(-1, -1, -1));
octree.Insert("blah", -1, 0, -1);
_assert.Equal("blah", octree.Find(-1, 0, -1));
}