# Your First Tests with Vitest

A unit test is a few lines of code that check one piece of your code and shout when it breaks, and Vitest's describe, it and expect let you write one, run it and read the result.

![Cheat sheet: Your First Tests with Vitest](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/677a614649ff4ad5a055d331d589cef0.webp)

- Category: JavaScript
- Level: Journeyman
- Tags: "describe", "it and expect", "Red", "Green", "Refactor", Assertion (unit-testing), JavaScript, Test-Driven Development, Unit Test (javascript), unit testing, Vitest (javascript)
- Updated: November 1, 2026

Source: https://www.ask-codey.com/cheat-sheets/javascript-testing-first-tests-with-vitest-cheat-sheet