public void GetDescendentsCount()
{
var r = new MapNode(new MapTree(), "r");
var c1 = new MapNode(r, "C");
var c11 = new MapNode(c1, "6");
var c12 = new MapNode(c1, "2");
var c121 = new MapNode(c12, "c121");
var c13 = new MapNode(c1, "4");
var c14 = new MapNode(c1, "7");
var c15 = new MapNode(c1, "1");
var c16 = new MapNode(c1, "5");
var c17 = new MapNode(c1, "3");
var c2 = new MapNode(r, "B");
var c3 = new MapNode(r, "C", NodePosition.Left);
var c31 = new MapNode(c3, "c31");
var c32 = new MapNode(c3, "c32");
int count = r.GetDescendentsCount();
Assert.AreEqual(13, count);
}