public void Degree()
{
var myGraph = new DirectedGraph <int, EdgeData>();
myGraph.AddNodes(1, 2, 3, 4);
myGraph.AddEdges(
(1, 2, dummyEdgeData),
(2, 3, dummyEdgeData),
(2, 4, dummyEdgeData),
(3, 4, dummyEdgeData)
);
myGraph.Degree(1).Should().Be(1);
myGraph.Degree(2).Should().Be(2);
myGraph.Degree(3).Should().Be(1);
}
