[server] Configure tests

Test Plan: Run yarn test from server directory: test should fail due to No tests found, exiting with code 1. Also restart both web and server and check if there are no errors.

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D564