rake test runs but has still a lot of errors

I intentionally exit(1) if the test suite fails. 

Travis runs now the unit tests. See https://travis-ci.org/ngiger/oddb.org/builds/10672013.
<..>
Finished in 118.072880642 seconds.
1486 tests, 2263 assertions, 104 failures, 223 errors, 0 pendings, 0 omissions, 14 notifications
82.5707% passed
12.59 tests/s, 19.17 assertions/s
The command "rake test" exited with 1.