public void AdjacencyList_Filter_SelectesPartOfVertices()
{
int vertex1 = 10;
int vertex2 = 20;
int vertex3 = 30;
int vertex4 = 40;
string edge1 = "20-30";
string edge2 = "30-40";
AdjacencyList <int, string> adjacencyList = new AdjacencyList <int, string>();
adjacencyList.AddVertex(vertex1);
adjacencyList.AddVertex(vertex2);
adjacencyList.AddVertex(vertex3);
adjacencyList.AddVertex(vertex4);
adjacencyList.AddEdge(vertex2, vertex3, edge1);
adjacencyList.AddEdge(vertex3, vertex4, edge2);
IGraph <int, string> filtered = adjacencyList.Filter((v1, v2, ed) => v1 == 20);
Assert.Equal(2, filtered.NumVertices);
Assert.True(filtered.HasVertex(vertex2));
Assert.True(filtered.HasVertex(vertex3));
Assert.Equal(edge1, filtered.FindEdge(vertex2, vertex3));
}
