Project to show:
- how to test your code with a real MongoDB instance. The medium article https://amcereijo.medium.com/how-to-test-with-mongodb-with-node-js-b05f94aa17a
- how to test your code with a external service using nock. The medium article https://amcereijo.medium.com/testing-in-node-js-with-external-http-services-dependency-8d9e8be1f0fa