public void Test_Finds_by_Predicate()
{
var node1 = new Node ("Node1");
var node2 = new Node ("Node2");
var node3 = new Node ("Node3");
var node4 = new Node ("Node1");
var node5 = new Node ("Node1");
var node6 = new Node ("Node6");
node1.AddChild (node2);
node1.AddChild (node3);
node2.AddChild (node4);
node3.AddChild (node5);
var wld = new World ();
wld.AddChild (node1);
Assert.AreEqual (3, wld.Finds (x => x.Name == "Node1").Count());
Assert.AreEqual (1, wld.Finds (x => x.Name == "Node2").Count ());
Assert.AreEqual (1, wld.Finds (x => x.Name == "Node3").Count ());
Assert.AreEqual (0, wld.Finds (x => x.Name == "Node4").Count ());
// Update()を呼ぶまで更新されない
wld.AddChild (node6);
Assert.AreEqual (0, wld.Finds (x => x.Name == "Node6").Count ());
wld.Update (0);
Assert.AreEqual (1, wld.Finds (x => x.Name == "Node6").Count ());
}