public void GraphOfSameType(bool value)
{
Graph graph = new MatrixGraph(10, true);
graph.AddEdge(0, 9, 10);
graph.AddEdge(2, 0, 5);
Graph sameTypeGraph = graph.NewGraphOfSameType(5, value);
Assert.Equal(5, sameTypeGraph.VerticesCount);
Assert.Equal(value, sameTypeGraph.Directed);
Assert.Equal(0, sameTypeGraph.EdgesCount);
Assert.IsType <MatrixGraph>(sameTypeGraph);
}