Docs: Testing with Jest

[uzairali001]

What is the improvement or update you wish to see?

Link to documentation
There is a small error in this documentation, In jest.config.mjs file the import needs to include .js extension like this import nextJest from 'next/jest.js' otherwise it shows this error

Error [ERR_MODULE_NOT_FOUND]: Cannot find module 'C:\Users\uzair\Downloads\next-test\node_modules\next\jest' imported from C:\Users\uzair\Downloads\next-test\jest.config.mjs
Did you mean to import next-test/node_modules/next/jest.js?
    at new NodeError (node:internal/errors:399:5)
    at finalizeResolution (node:internal/modules/esm/resolve:326:11)
    at moduleResolve (node:internal/modules/esm/resolve:945:10)
    at defaultResolve (node:internal/modules/esm/resolve:1153:11)
    at nextResolve (node:internal/modules/esm/loader:163:28)
    at ESMLoader.resolve (node:internal/modules/esm/loader:838:30)
    at ESMLoader.getModuleJob (node:internal/modules/esm/loader:424:18)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:77:40)
    at link (node:internal/modules/esm/module_job:76:36)

I created the pull request to fix this issue #54107

Here's the fresh nextjs install with default options repo, in which I've only installed jest by following the documentation npm install --save-dev jest jest-environment-jsdom @testing-library/react @testing-library/jest-dom and it's also showing this error.

Is there any context that might help us understand?

I created the pull request to add .js extension while importing jest library which resolves this issue.

Does the docs page already exist? Please link to it.

https://nextjs.org/docs/pages/building-your-application/optimizing/testing#jest-and-react-testing-library

[balazsorban44]

Thanks, I think your PR is valid, so I reopened it. See #54107 (comment)

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