public void FindVertexCut_WhenPresentSeparators_ThenSeparators()
{
// given
var graph = new UndirectedSimpleGraph <int, object, object>(Enumerable.Range(0, 12));
graph.AddEdgeBetween(graph[0], graph[1]);
graph.AddEdgeBetween(graph[0], graph[2]);
graph.AddEdgeBetween(graph[0], graph[7]);
graph.AddEdgeBetween(graph[1], graph[2]);
graph.AddEdgeBetween(graph[1], graph[3]);
graph.AddEdgeBetween(graph[1], graph[4]);
graph.AddEdgeBetween(graph[3], graph[5]);
graph.AddEdgeBetween(graph[4], graph[5]);
graph.AddEdgeBetween(graph[5], graph[6]);
graph.AddEdgeBetween(graph[7], graph[8]);
graph.AddEdgeBetween(graph[7], graph[9]);
graph.AddEdgeBetween(graph[7], graph[11]);
graph.AddEdgeBetween(graph[8], graph[9]);
graph.AddEdgeBetween(graph[9], graph[10]);
graph.AddEdgeBetween(graph[9], graph[11]);
graph.AddEdgeBetween(graph[10], graph[11]);
// when
IEnumerable <Vertex <int> > result = graph.FindVertexCut();
// then
result.Should().BeEquivalentTo(
new[] { graph[0], graph[1], graph[5], graph[7] });
}
public void FindVertexCut_WhenNoSeparators_ThenEmptyList()
{
// given
var graph = new UndirectedSimpleGraph <int, object, object>(Enumerable.Range(0, 6));
graph.AddEdgeBetween(graph[0], graph[1]);
graph.AddEdgeBetween(graph[0], graph[2]);
graph.AddEdgeBetween(graph[1], graph[2]);
graph.AddEdgeBetween(graph[1], graph[3]);
graph.AddEdgeBetween(graph[1], graph[4]);
graph.AddEdgeBetween(graph[2], graph[3]);
graph.AddEdgeBetween(graph[3], graph[5]);
graph.AddEdgeBetween(graph[4], graph[5]);
// when
IEnumerable <Vertex <int> > result = graph.FindVertexCut();
// then
result.Should().BeEmpty();
}