public void Clone()
{
var graph = new EdgeListGraph <int, Edge <int> >();
AssertEmptyGraph(graph);
var clonedGraph = graph.Clone();
Assert.IsNotNull(clonedGraph);
AssertEmptyGraph(clonedGraph);
clonedGraph = (EdgeListGraph <int, Edge <int> >)((ICloneable)graph).Clone();
Assert.IsNotNull(clonedGraph);
AssertEmptyGraph(clonedGraph);
var edge1 = new Edge <int>(1, 2);
var edge2 = new Edge <int>(1, 3);
var edge3 = new Edge <int>(2, 3);
graph.AddVerticesAndEdgeRange(new[] { edge1, edge2, edge3 });
AssertHasVertices(graph, new[] { 1, 2, 3 });
AssertHasEdges(graph, new[] { edge1, edge2, edge3 });
clonedGraph = graph.Clone();
Assert.IsNotNull(clonedGraph);
AssertHasVertices(clonedGraph, new[] { 1, 2, 3 });
AssertHasEdges(clonedGraph, new[] { edge1, edge2, edge3 });
clonedGraph = (EdgeListGraph <int, Edge <int> >)((ICloneable)graph).Clone();
Assert.IsNotNull(clonedGraph);
AssertHasVertices(clonedGraph, new[] { 1, 2, 3 });
AssertHasEdges(clonedGraph, new[] { edge1, edge2, edge3 });
}
