Fix test hiding

Change-Id: I1597882fb679cb08e449439b64ee510621e677a1
Reference: https://github.com/couchbase/couchbase-ruby-model/issues/3
Reviewed-on: http://review.couchbase.org/24684
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>