JavaScript Development Substack
Vitest is a powerful test runner built specifically for Vite projects, offering seamless integration without a complicated setup. It’s optimized for efficiency, using modern JavaScript features like ESM imports and top-level await to streamline testing. With Vitest, Vite developers can easily write effective tests, simplifying their workflow while taking full advantage of cutting-edge JavaScript capabilities.
In this section, you'll learn how to set up a modern test runner for your project using a simple example. Once configured, you'll have multiple ways to run tests on your code. This article covers two common testing scenarios: basic functionality checks and API call testing.
Let’s start by testing a simple function, like adding two numbers. This example is perfect for getting familiar with the test runner, especially if you're new to testing or working on smaller projects. We’ll create a project, install the test runner, write the necessary script, and run it to verify the functionality.
Let’s write some basic tests. We’ll create a test file named math.test.js to demonstrate how to write tests. Below is the code:
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