public void DfsTopologicalSort_WhenAcyclicGraph_ThenTopologicalOrder()
{
// given
DirectedSimpleGraph <int, object, object> graph = new DirectedSimpleGraph <int, object, object>(
Enumerable.Range(0, 6).ToArray());
graph.AddEdgeBetween(graph[0], graph[2]);
graph.AddEdgeBetween(graph[0], graph[4]);
graph.AddEdgeBetween(graph[1], graph[0]);
graph.AddEdgeBetween(graph[1], graph[4]);
graph.AddEdgeBetween(graph[3], graph[1]);
graph.AddEdgeBetween(graph[3], graph[0]);
graph.AddEdgeBetween(graph[3], graph[2]);
graph.AddEdgeBetween(graph[5], graph[1]);
graph.AddEdgeBetween(graph[5], graph[2]);
graph.AddEdgeBetween(graph[5], graph[4]);
var expecteds = new Vertex <int>[][] {
new Vertex <int>[] { graph[3], graph[5], graph[1], graph[0], graph[2], graph[4] },
new Vertex <int>[] { graph[5], graph[3], graph[1], graph[0], graph[2], graph[4] },
new Vertex <int>[] { graph[3], graph[5], graph[1], graph[0], graph[4], graph[2] },
new Vertex <int>[] { graph[5], graph[3], graph[1], graph[0], graph[4], graph[2] }
};
// when
IEnumerable <Vertex <int> > result = TopologicalSorting.DfsTopologicalSort(graph);
// then
expecteds.Should().ContainEquivalentOf(result.ToArray());
}
public void DfsTopologicalSort_WhenCyclicGraph_ThenDirectedCyclicGraphException()
{
// given
DirectedSimpleGraph <int, object, object> graph = new DirectedSimpleGraph <int, object, object>(
Enumerable.Range(0, 6).ToArray());
graph.AddEdgeBetween(graph[0], graph[2]);
graph.AddEdgeBetween(graph[0], graph[4]);
graph.AddEdgeBetween(graph[1], graph[0]);
graph.AddEdgeBetween(graph[1], graph[4]);
graph.AddEdgeBetween(graph[2], graph[1]);
graph.AddEdgeBetween(graph[3], graph[1]);
graph.AddEdgeBetween(graph[3], graph[0]);
graph.AddEdgeBetween(graph[3], graph[2]);
graph.AddEdgeBetween(graph[5], graph[1]);
graph.AddEdgeBetween(graph[5], graph[2]);
graph.AddEdgeBetween(graph[5], graph[4]);
// when
Action action = () => TopologicalSorting.DfsTopologicalSort(graph);
// then
action.Should().Throw <DirectedCyclicGraphException>();
}