Docs: add section on App Router testing

[DonikaV]

What is the improvement or update you wish to see?

All official examples are outdated
https://github.com/vercel/next.js/tree/canary/examples/with-jest
I am trying to find any example of next 13 app folder and tests setup.

Is there any context that might help us understand?

When i try run tests from this example repo
https://github.com/vercel/next.js/tree/canary/examples/with-jest
I am getting many errors about metadata, or about Context Providers and etc.

[balazsorban44]

Thanks for the feedback! We are working on a recommendation in this regard.

Related issues are #47448 and #47299

We will get back when we have more information! 🙏

[leerob]

#47448 (comment)

[leerob]

https://nextjs.org/docs/app/building-your-application/testing

[github-actions]

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