How to Unit Test with NodeJS?

We will use Mocha and Chai to do unit tests and talk about the importance of testing.

In this article, we are going to dive into unit testing and learn about how to use Mocha and Chai to write our tests. We will also take a look at how to do granular testing, an important concept when you have hundreds or thousands of unit tests. We will also talk about why testing is important.

Overview

• What is unit testing?
• Mocha — what, how, run, result
• Chai — what, how, run, result
• Testing a real NodeJS function — code, test, run, result
• Granular testing with the Mocha CLI — test a single file, test a group of tests or a single test
• Testing Opinion — granular testing, testing & code quality
• Testing Asynchronous functions
• Review

What is unit testing?

“UNIT TESTING is a level of software testing where individual units/ components of a software are tested. The purpose is to validate that each unit of the software performs as designed. A unit is the smallest testable part of any software. It usually has one or a few inputs and usually a single output. In…