Describe the problem that you experienced

When looking up the Vitest approach to async callbacks in spec tests, this page gives the Jasmine implementation. However, Vitest has no such "DoneFN" type, and the example is therefore incorrect.

The page: https://github.com/angular/angular/blob/main/adev/src/content/guide/testing/services.md

The Vitest documentation: https://vitest.dev/guide/migration.html#done-callback

Enter the URL of the topic with the problem

https://github.com/angular/angular/blob/main/adev/src/content/guide/testing/services.md

Describe what you were looking for in the documentation

The Vitest DoneFN equivalent

Describe the actions that led you to experience the problem

No response

Describe what you want to experience that would fix the problem

No response

Add a screenshot if that helps illustrate the problem

No response

If this problem caused an exception or error, please paste it here

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Provide any additional information here in as much as detail as you can