public void DFSTest1()
        {
            Graph SomeGraph = new Graph();

            int[] correctDFS  = { 1, 2, 3, 4 };
            int[] correctDFS2 = { 1, 3, 4, 2 };
            int[] tryDFS      = new int[4];

            SomeGraph.AddNode(1);
            SomeGraph.AddNode(2);
            SomeGraph.AddNode(3);
            SomeGraph.AddNode(4);
            SomeGraph.AddEdge(1, 2);
            SomeGraph.AddEdge(1, 3);
            SomeGraph.AddEdge(3, 4);

            int i = 0;

            foreach (int n in GraphAlgorithms.DFS(SomeGraph, 1))
            {
                tryDFS[i++] = n;
            }

            try
            {
                CollectionAssert.AreEqual(correctDFS, tryDFS);
            }
            catch
            {
                CollectionAssert.AreEqual(correctDFS2, tryDFS);
            }
        }