public void ExtensionTest()
{
var graph = new AdjacencyListGraph(8);
graph.AddArrow(0, 1);
graph.AddArrow(1, 2);
graph.AddArrow(2, 0);
graph.AddArrow(3, 1);
graph.AddArrow(3, 2);
graph.AddArrow(5, 2);
graph.AddArrow(4, 3);
graph.AddArrow(3, 4);
graph.AddArrow(4, 5);
graph.AddArrow(6, 5);
graph.AddArrow(5, 6);
graph.AddArrow(7, 4);
var result = graph.FindCycles();
Assert.That(result.Count, Is.EqualTo(1));
//CollectionAssert.AreEqual(new[] { 0, 1, 2 }, result[0]);
//CollectionAssert.AreEqual(new[] { 3, 4 }, result[1]);
//CollectionAssert.AreEqual(new[] { 5, 6 }, result[2]);
}