public void BreadthFirstTest()
{
var graph = new UndirectedGraph <string>();
graph.Add("v1");
graph.Add("v2");
graph.Add("v3");
graph.Add("v4");
graph.Add("v5");
graph.Add("v6");
graph.Add("v7");
graph.Add("v8");
graph.Add(new UndirectedEdge <string>("v1", "v2"));
graph.Add(new UndirectedEdge <string>("v1", "v3"));
graph.Add(new UndirectedEdge <string>("v2", "v4"));
graph.Add(new UndirectedEdge <string>("v2", "v5"));
graph.Add(new UndirectedEdge <string>("v4", "v8"));
graph.Add(new UndirectedEdge <string>("v5", "v8"));
graph.Add(new UndirectedEdge <string>("v3", "v6"));
graph.Add(new UndirectedEdge <string>("v3", "v7"));
graph.Add(new UndirectedEdge <string>("v6", "v7"));
foreach (var vertex in graph.BreadthFirst())
{
Console.WriteLine(vertex);
}
}