v4: Add generateSessionCookie testing helper

[lucasnetto]

Checklist

• I have looked into the Readme, Examples, and FAQ and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

In v3 I'm able to use the generateSessionCookie helper in my tests, but it is not available on v4.

Describe the ideal solution

I think we should have this helper on v4, or an alternative to it.

Alternatives and current workarounds

No response

Additional context

No response

[guabu]

Thanks for the feedback @lucasnetto! We'll work on getting some testing helpers added to v4.

[guabu]

@lucasnetto the helper should now be available in the latest release (4.0.0-beta.14): https://github.com/auth0/nextjs-auth0/tree/v4?tab=readme-ov-file#testing-helpers

[lucasnetto]

Hi, thanks for adding it back!

But I'm getting an error when trying to use it:
Error: Package subpath './testing' is not defined by "exports" in /Users/lucas.netto/Developer/repo/packages/common/node_modules/@auth0/nextjs-auth0/package.json

Would this be a problem with my setup? I find it strange that it's only happening for the testing package