public void AddTest()
{
UndirectedGraph <string> graph = new UndirectedGraph <string>();
graph.AddNode(new GraphNode <string>("node1"));
graph.AddNode(new GraphNode <string>("node2"));
graph.AddNode(new GraphNode <string>("node3"));
graph.AddNode(new GraphNode <string>("node4"));
graph.AddNode(new GraphNode <string>("node5"));
Assert.IsTrue(graph.Contains("node4"));
Assert.AreEqual(5, graph.Size);
Assert.IsFalse(graph.Contains("dylan"));
}
