Unit Testing With Jest in Javascript

Unit Testing With Jest in Javascript

I decided to spend today learning the ins and out of using Jest and creating test cases so that I may add unit tests to my projects.

Everyone talks about the advantages of being able to write tests and while I have learned how to read tests, I have never really taken the time to write tests for any of my projects. Tests are important for a wide number of reasons: they allow us to quickly identify issues within our code, they also ensure we are properly separating our functions to only perform one job, and they help provide a clear understanding of what the code should do, among other things. So I decided to spend today learning the ins and out of using Jest and creating test cases so that I may add unit tests to my projects.

With that being said, today I am going to take you through a little walk through of getting started with unit testing and hopefully by the end of this you will be able to go back to some of your projects and add some tests of your own.

First things first, I highly suggest you take a look at the docs for Jest. They are pretty beginner friendly and straight forward. Next, you can install Jest by running either: yarn add — dev jest OR npm i — save-dev jest (please note, it should be dash dashdev/dash dashsave). You must have a package.json file in order to use Jest. If you do not have one, you can run npm init.

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