test_build_server: additional tests.

@jzoldak @clytwynec @muhammad-ammar 

Will these cover some of the smoke/critical areas for a new build server (in terms of bok-choy)?
What is the likelihood of there being more tests added to this file (or the matlab problem one below)? 

I'm basically wondering if it is worth being more specific to prevent us unknowingly running a lot more tests than intended at some point.