# Jest

> import LiteYouTubeEmbed from 'react-lite-youtube-embed';

## Pages

- [Architecture](architecture.md): import LiteYouTubeEmbed from 'react-lite-youtube-embed';
- [Bypassing module mocks](bypassingmodulemocks.md): Jest allows you to mock out whole modules in your tests, which can be useful for testing if your code is calling func...
- [Jest CLI Options](cli.md): The`jest`command line runner has a number of useful options. You can run`jest --help`to view all available option...
- [Code Transformation](codetransformation.md): Jest runs the code in your project as JavaScript, but if you use some syntax not supported by Node out of the box (su...
- [Configuring Jest](configuration.md): The Jest philosophy is to work great by default, but sometimes you just need more configuration power.
- [Using with DynamoDB](dynamodb.md): With the [Global Setup/Teardown](Configuration.md#globalsetup-string) and [Async Test Environment](Configuration.md#t...
- [ECMAScript Modules](ecmascriptmodules.md): :::caution
- [Environment Variables](environmentvariables.md): Jest sets the following environment variables:
- [ES6 Class Mocks](es6classmocks.md): Jest can be used to mock ES6 classes that are imported into files you want to test.
- [Expect](expectapi.md): When you're writing tests, you often need to check that values meet certain conditions.`expect`gives you access to ...
- [Getting Started](gettingstarted.md): Install Jest using your favorite package manager:
- [Globals](globalapi.md): In your test files, Jest puts each of these methods and objects into the global environment. You don't have to requir...
- [Jest Community](jestcommunity.md): The community around Jest is working hard to make the testing experience even greater.
- [The Jest Object](jestobjectapi.md): The`jest`object is automatically in scope within every test file. The methods in the`jest`object help create mock...
- [Jest Platform](jestplatform.md): You can cherry pick specific features of Jest and use them as standalone packages. Here's a list of the available pac...
- [Manual Mocks](manualmocks.md): Manual mocks are used to stub out functionality with mock data. For example, instead of accessing a remote resource l...
- [Migrating to Jest](migrationguide.md): If you'd like to try out Jest with an existing codebase, there are a number of ways to convert to Jest:
- [Mock Functions](mockfunctionapi.md): Mock functions are also known as "spies", because they let you spy on the behavior of a function that is called indir...
- [Mock Functions](mockfunctions.md): Mock functions allow you to test the links between code by erasing the actual implementation of a function, capturing...
- [Using with MongoDB](mongodb.md): With the [Global Setup/Teardown](Configuration.md#globalsetup-string) and [Async Test Environment](Configuration.md#t...
- [More Resources](moreresources.md): By now you should have a good idea of how Jest can help you test your applications. If you're interested in learning ...
- [Using with puppeteer](puppeteer.md): With the [Global Setup/Teardown](Configuration.md#globalsetup-string) and [Async Test Environment](Configuration.md#t...
- [Setup and Teardown](setupandteardown.md): Often while writing tests you have some setup work that needs to happen before tests run, and you have some finishing...
- [Snapshot Testing](snapshottesting.md): Snapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly.
- [Testing Asynchronous Code](testingasynccode.md): It's common in JavaScript for code to run asynchronously. When you have code that runs asynchronously, Jest needs to ...
- [Testing Web Frameworks](testingframeworks.md): Jest is a universal testing platform, with the ability to adapt to any JavaScript library or framework. In this secti...
- [Timer Mocks](timermocks.md): The native timer functions (i.e.,`setTimeout()`,`setInterval()`,`clearTimeout()`,`clearInterval()`) are less than...
- [Troubleshooting](troubleshooting.md): Uh oh, something went wrong? Use this guide to resolve issues with Jest.
- [An Async Example](tutorialasync.md): First, enable Babel support in Jest as documented in the [Getting Started](GettingStarted.md#using-babel) guide.
- [Testing React Native Apps](tutorialreactnative.md): At Facebook, we use Jest to test [React Native](https://reactnative.dev/) applications.
- [DOM Manipulation](tutorialjquery.md): Another class of functions that is often considered difficult to test is code that directly manipulates the DOM. Let'...
- [From v28 to v29](upgradingtojest29.md): Upgrading Jest from v28 to v29? This guide aims to help refactoring your configuration and tests.
- [From v29 to v30](upgradingtojest30.md): Upgrading Jest from v29 to v30? This guide aims to help refactoring your configuration and tests.
- [Using Matchers](usingmatchers.md): Jest uses "matchers" to let you test values in different ways. This document will introduce some commonly used matche...
- [Watch Plugins](watchplugins.md): The Jest watch plugin system provides a way to hook into specific parts of Jest and to define watch mode menu prompts...
- [Using with webpack](webpack.md): Jest can be used in projects that use [webpack](https://webpack.js.org/) to manage assets, styles, and compilation. w...
- [_Typescriptexamplesnote](typescriptexamplesnote.md): :::info