Toptal
Dealing with a real database for integration and end-to-end testing can pose some challenges. One way of working around them is to use an in-memory database that integrates well with the testing framework and provides APIs to manipulate its state from test code.
In this article, Toptal Freelance Software Engineer Mikhail Angelov shows how you can write integration and end-to-end tests easily for your Node.js and MongoDB application without having to write complicated setup/teardown code.
Source: Toptal