No vertices:
directed: false
vcount: 0
edges: {
}
No edges:
directed: false
vcount: 5
edges: {
}
Prefer more edges to make a star of double edges:
directed: false
vcount: 5
edges: {
0 1
0 1
0 2
0 2
0 3
0 3
0 4
0 4
}
Prefer older edges to make a star:
directed: false
vcount: 7
edges: {
0 1
0 1
0 2
0 3
0 3
0 4
0 5
0 5
0 6
}
Checking if adding one edge per step makes a tree.
Checking if these errors are properly handled:
Negative number of vertices.
Negative number of edges.
Negative aging bin.
Negative zero appeal.