1No vertices:
2Incidence matrix:
3Row ids:
4( )
5Col ids:
6( )
7
8One vertex:
9Incidence matrix:
10Row ids:
11( )
12Col ids:
13( 0 )
14
15Disconnected graph with multiple edges:
16Incidence matrix:
17[        1        3        0
18         1        1        2
19         0        0        0 ]
20Row ids:
21( 0 3 5 )
22Col ids:
23( 1 2 4 )
24
25Checking non-bipartite graph.
26Incidence matrix:
27[        1        3        0
28         1        1        2
29         0        0        0 ]
30Row ids:
31( 0 3 5 )
32Col ids:
33( 1 2 4 )
34
35Checking wrong type vector size error handling.
36