public void IncrementalConnectedComponent()
{
var g = new AdjacencyGraph <int, SEquatableEdge <int> >();
g.AddVertexRange(new int[] { 0, 1, 2, 3 });
var components = AlgorithmExtensions.IncrementalConnectedComponents(g);
var current = components();
Assert.AreEqual(4, current.Key);
g.AddEdge(new SEquatableEdge <int>(0, 1));
current = components();
Assert.AreEqual(3, current.Key);
g.AddEdge(new SEquatableEdge <int>(2, 3));
current = components();
Assert.AreEqual(2, current.Key);
g.AddEdge(new SEquatableEdge <int>(1, 3));
current = components();
Assert.AreEqual(1, current.Key);
}