nodejs-datastore: v4 doesn't release resource

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The library does not release a resource and the unit tests don’t exist. Is there a new command that we have to call before exiting from the application?

Environment details

• OS: Mac, Linux, Windows
• Node.js version: latest of 8, 10, 11
• npm version: provided by node
• @google-cloud/datastore version: 4.0.0

Steps to reproduce

1. $ docker pull google/cloud-sdk:latest
2. $ git clone https://github.com/ert78gb/google-datastore-emulator.git
3. $ cd google-datastore-emulator
4. $ npm i
5. $ npm install --no-save @google-cloud/datastore
6. $ npm test

All test is pass, but mocha does not exists. The reason is there is a resource, timer, promise that running in the background and mocha waiting for the exit.

The 3.1.2 version of the lib worked perfectly, but something changed. You can see it in the travis build logs https://travis-ci.org/ert78gb/google-datastore-emulator/builds

I don’t want to use process.exit() at the end of the test, because it hides resource release problems and it is also not a good practice.

Making sure to follow these steps will guarantee the quickest resolution possible.

Thanks!