[Tech debt] Remove testCustomHook in favor of RTL renderHook
#7260
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- it's not rendering any jsx, so no need to use `.tsx`
- tests where the syntax is a straightforward conversion to `result.current`
- they're now typed properly by `renderHook`, so doing some mionr DRYing out here
…een tests - RTL auto-cleans up state between tests (https://testing-library.com/docs/react-testing-library/setup/#skipping-auto-cleanup) so tests on Enzyme that were expecting state to be preserved are now failing, and need to be updated For tests that can import directly from `@testing-library/react`, `/pure` is an option to not clear state between tests
- use a common `getRender` util for asserting on rendered content
- make it all one test instead of 3 different ones since state is resetting between tests - skip a test util since we're rerendering
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testCustomHook in favor of RTL renderHooktestCustomHook in favor of RTL renderHook
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Summary
Twas the turn of the year of our lawd 2022, and EUI had not yet heard the good word of RTL. At the time, I wanted a way to quickly and easily unit test custom hooks and I made this horrifyingly janky DIY util to do so.
Thankfully,
@testing-libraryactually has a fully fledged and battle-testedrenderHookutil that is much better in almost every measurable way (https://react-hooks-testing-library.com/reference/api), and that we've already started using in other places.This PR rips out old instances of
testCustomHookand replaces them with therenderHookAPI, and rids us of my jank 4eva.QA
If CI passes, we should be good to go 🤞
General checklist
N/A, tests/tech debt only only