Basic test

Merges:
[        1        2
         0        3 ]
Modularity: ( -0.333333 -0.222222 0 )
Membership: ( 0 0 0 )

Without modularity and membership calculation

Merges:
[        1        2
         0        3 ]

Without merges matrix calculation

Modularity:
( -0.333333 -0.222222 0 )

Bug 2042

Merges:
[        0        1 ]
Modularity: ( -0.5 0 )
Membership: ( 0 0 1 )

Small weighted graph

Merges:
[        3        4
         1        2
         0        5
         7        8
         6        9 ]
Modularity: ( -0.196145 -0.0895692 -0.0147392 0.146259 0.122449 0 )
Membership: ( 0 1 1 2 2 0 )

Isolated vertices

Merges:
[ 0-by-2 ]
Modularity: ( NaN )
Membership: ( 0 1 2 3 4 )
