---
title: "Intro to Unit Testing with Jest"
url: https://daily.dev/posts/intro-to-unit-testing-with-jest-vtgncabl3
source_url: https://javascript.plainenglish.io/intro-to-unit-testing-with-jest-628aa3c6f832
type: article
source: "JavaScript in Plain English"
published: 2021-04-24T08:38:02.254Z
updated: 2026-03-15T04:50:27.221Z
tags: ["general-programming", "testing", "webdev"]
reading_time: 8
upvotes: 25
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Intro to Unit Testing with Jest

**[JavaScript in Plain English](https://daily.dev/sources/jsPlainEnglish)** · 8 min read · 25 upvotes · 0 comments

## Summary

Tests inform developers on the behavior of what certain parts of the application should accomplish. A unit test is a way of testing the smallest piece of code (aka unit or component) that can be isolated from the software. Understanding how the code will be tested informs developers on how code should best be composed.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://javascript.plainenglish.io/intro-to-unit-testing-with-jest-628aa3c6f832>

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---

Tags: [#general-programming](https://daily.dev/tags/general-programming), [#testing](https://daily.dev/tags/testing), [#webdev](https://daily.dev/tags/webdev)

[View this post on daily.dev](https://daily.dev/posts/intro-to-unit-testing-with-jest-vtgncabl3)