How To Write Unit Tests In NodeJS With JEST Test Library

A beginner’s Guide with an example project

Unit testing is as important as developing a project nowadays and it becomes an integral part of development. It actually boosts the quality of the code and the confidence of developers. Sometimes you have to fix the code that is in production and you make some changes before deploying that in the production environment. Your confidence level definitely increases when you have quality unit tests written for these applications.

There are so many libraries that can be used for unit testing in nodejs applications. Jest library is one of them. According to their website, Jest is a delightful JavaScript Testing Framework with a focus on simplicity. Jest aims to work out of the box, config free, on most JavaScript projects.

Make tests that keep track of large objects with ease. Snapshots live either alongside your tests or embedded inline. Tests are parallelized by running them in their own processes to maximize performance. From it to expect - Jest has the entire toolkit in one place. Well documented, well maintained, well good.

In this post, we will see how we can get started with the Jest library with some example projects.

• Prerequisites