public void Recursive_StartFromE()
{
var dfsOrdering = new List <GraphNode <string> >();
DFS.DFS_Recursive(_nodeE, dfsOrdering);
Assert.AreEqual(7, dfsOrdering.Count);
Assert.AreEqual("E", dfsOrdering[0].Value);
Assert.AreEqual("B", dfsOrdering[1].Value);
Assert.AreEqual("F", dfsOrdering[2].Value);
Assert.AreEqual("D", dfsOrdering[3].Value);
Assert.AreEqual("A", dfsOrdering[4].Value);
Assert.AreEqual("C", dfsOrdering[5].Value);
Assert.AreEqual("G", dfsOrdering[6].Value);
}