I really like the idea of test wiki's. I think it should become an obligatory step in the process of creating a wiki. One should prove a wiki can be active.
It shouldn't be obligatory for _all_ languages. Languages with many speakers simply should be there. Even if the wiki is not active now. It makes it easier for people to get started. If I first had to do a test wiki for Bambara and Fulfulde, or if it had taken 4 months to set up these Wikipedias, there would still be nothing on ff.wp and bm.wp.
Fulfulde is spoken by millions of people. Though I don't think there are many speakers who can be expected to start adding and editing when it's more complicated than the normal process.