public void BfsNonRecursive()
{
var sut = new AdjacencyListGraph <int>();
sut.AddEdge(0, 1);
sut.AddEdge(0, 3);
sut.AddEdge(1, 2);
sut.AddEdge(3, 4);
sut.AddEdge(4, 5);
var bfs = sut.BreadthFirstSearch();
Assert.Equal(0, bfs[0]);
Assert.Equal(1, bfs[1]);
Assert.Equal(3, bfs[2]);
Assert.Equal(2, bfs[3]);
Assert.Equal(4, bfs[4]);
Assert.Equal(5, bfs[5]);
}