Test memory leak #364
Description
On PR #344, the unit tests raise a warning:
A worker process has failed to exit gracefully and has been force exited. This is likely caused by tests
leaking due to improper teardown. Try running with --detectOpenHandles to find leaks. Active
timers can also cause this, ensure that .unref() was called on them.
This is going to become a problem down the road, figure out the cause and fix it