1No vertices:
2directed: false
3vcount: 0
4edges: {
5}
6No edges:
7directed: false
8vcount: 5
9edges: {
10}
11Prefer more edges to make a star of double edges:
12directed: false
13vcount: 5
14edges: {
150 1
160 1
170 2
180 2
190 3
200 3
210 4
220 4
23}
24Prefer older edges to make a star:
25directed: false
26vcount: 7
27edges: {
280 1
290 1
300 2
310 3
320 3
330 4
340 5
350 5
360 6
37}
38Checking if adding one edge per step makes a tree.
39Checking if these errors are properly handled:
40Negative number of vertices.
41Negative number of edges.
42Negative aging bin.
43Negative zero appeal.
44