In order to do this, needed to add a few extra pieces:
* extracted the simple database download so that it only happens
once and is shared across all tests.
* needed to update mocha to latest version since that has the new API
* But typings isn't updated yet, so submitted a PR into DefinitelyTyped
for that.
* Added a concept of helper files for test runs. These helper files
will contain all the shared global setup.
Unfortunately, at this point, we can't run using a language pack since
we would also need to download the the ql repository from somewhere.
6046cf1472