1No nodes:
2directed: false
3vcount: 0
4edges: {
5}
6No edges:
7directed: false
8vcount: 3
9edges: {
10}
11Make a star of double edges:
12directed: true
13vcount: 5
14edges: {
151 0
161 0
172 0
182 0
193 0
203 0
214 0
224 0
23}
24Make a line:
25directed: true
26vcount: 7
27edges: {
281 0
292 1
303 2
314 3
325 4
336 5
34}
35Checking negative number of nodes error handling.
36Checking too few types error handling.
37Checking too many types error handling.
38Checking negative type for error handling.
39Checking too big type for error handling.
40Checking negative preference error handling.
41