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docs: add a note on when not to use renderHook #1093

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In https://github.com/testing-library/react-hooks-testing-library/blob/main/README.md there are two reasons when not to use react-hooks-testing-library:

  1. Your hook is defined alongside a component and is only used there 2. Your hook is easy to test by just testing the components using it

I think it still holds true and it would make sense to add this into renderHook docs. I've omitted the first point because it seems like the second point covers it. We could add both, though.

libraries publishing hooks. You should prefer `render` since a custom test
libraries publishing hooks.

Do not use `renderHook` when your hook is easy to test by just testing the components using it.
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Do not use `renderHook` when your hook is easy to test by just testing the components using it.
Do not use `renderHook` when your hook can be easily tested by testing the components using it.

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Thanks @zaicevas!
A minor suggestion here.

libraries publishing hooks.

Do not use `renderHook` when your hook is easy to test by just testing the components using it.
Alternatively, you should prefer `render` since a custom test
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Is "alternatively" really needed here? I think we can remove it :)

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