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Components: Refactor `Tooltip` tests to `@testing-library/react`

Open t-hamano opened this issue 2 years ago β€’ 8 comments

Part of #42753

What?

Refactoring of the Tooltip component is being considered in #42753. As a first step, I rewritten tests to @testing-library/react.

How?

I straightforwardly replacd enzyme tests with @testing-library/react, with a few exceptions, based on the following post:

Testing Instructions

Verify tests pass: npm run test-unit ./packages/components/src/tooltip/test/index.js

Screenshots or screencast

t-hamano avatar Aug 08 '22 11:08 t-hamano

Size Change: +149 B (0%)

Total Size: 1.24 MB

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build/block-library/blocks/video/style.css 174 B +15 B (+9%) πŸ”
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compressed-size-action

github-actions[bot] avatar Aug 08 '22 12:08 github-actions[bot]

Is there any reason why this PR is marked as a draft? All tests still pass πŸ˜„

@t-hamano, thank you for working on it.

@ciampo, there are still 60-ish test files that use enzyme. Is it something you want to have replaced with RTL universally?

gziolo avatar Aug 09 '22 07:08 gziolo

I now see that @walbo also opened PR https://github.com/WordPress/gutenberg/pull/43069 that refactors test files to use RTL instead of enzyme. I think it's a good opportunity you team up together and help each other to land changes πŸ˜„

gziolo avatar Aug 09 '22 07:08 gziolo

@ciampo, there are still 60-ish test files that use enzyme. Is it something you want to have replaced with RTL universally?

I'd love to, but currently don't have the capacity to work on it systematically. We're trying to chip at it when we can as part of other work on componentsΒ β€” but I know that @tyxla has been working on the switch to RTL too!

ciampo avatar Aug 09 '22 08:08 ciampo

@ciampo, processing 60 files isn't a simple effort. I feel you πŸ˜„ Anyway, if someone wants to champion the coordination process that would be ace!

gziolo avatar Aug 09 '22 08:08 gziolo

@gziolo

The existing test passed, but I was looking for any other tests needed. I can't help worrying alone, so I will update to review status πŸ˜…

t-hamano avatar Aug 09 '22 08:08 t-hamano

@ciampo, processing 60 files isn't a simple effort. I feel you πŸ˜„ Anyway, if someone wants to champion the coordination process that would be ace!

I'm definitely willing to help with this one, and we could get a few extra hands from @flootr and @brookewp.

tyxla avatar Aug 09 '22 12:08 tyxla

I'd be tempted to determine a new list of what we should be testing for Tooltip based on user behavior and interactions (WDYT, @mirka ?)

Looking at these tests, I'm starting to realize that our current implementation is missing a role=tooltip/aria-describedby relationship. So our new implementation probably needs to add those semantics. Which likely means that all current Tooltip usage in the codebase will need to be replaced one by one to check that it isn't causing semantic weirdness, e.g. having a redundant aria-label.

I wanted to mention this now because I think it means we have less pressure to write a perfectly comprehensive set of tests here, since it's unlikely we'd be able to bulk replace the existing Tooltip usage anyway.

(Sidenote: These RTL refactors are quickly exposing semantic gaps in our components, which is great πŸ˜„)

mirka avatar Aug 11 '22 08:08 mirka

I removed position prop by 3126a88 because there is no test for position prop. It might be good to add a test on position prop, but can we determine the position of the popover by RTL?

t-hamano avatar Aug 15 '22 11:08 t-hamano

@ciampo @mirka @tyxla

Thanks for the detailed review 😊 I believe I have corrected all the issues raised in the review.

I would further suggest the following improvements, does this make sense?

Use meaningful button names

<button>Hover Me!</button> to <button>Click Me!</button> or <button>Focus Me!</button> depending on the test case

Test name standardization

Unify show popover and show tooltip with show tooltip, etc.

Don't use settimeout

I am not sure if this is the correct way to do it, it looks like it could be rewritten simply as follows:

jest.useFakeTimers();
setTimeout( () => {
	expect( screen.getByText( 'Help text' ) ).toBeInTheDocument();
	jest.runOnlyPendingTimers();
	jest.useRealTimers();
}, TOOLTIP_DELAY );

// to...

act( () => jest.advanceTimersByTime( TOOLTIP_DELAY ) );
expect( screen.getByText( 'Help text' ) ).toBeInTheDocument();

If the latter implementation is a real timer instead of a fake timer, is there a performance problem? πŸ€”

t-hamano avatar Aug 15 '22 13:08 t-hamano

I appreciate your painstaking review. I believe I have corrected everything.

Note that the test command has changed because trunk was merged.

npm run test:unit ./packages/components/src/tooltip/test/index.js

t-hamano avatar Aug 20 '22 09:08 t-hamano

Done πŸš€

t-hamano avatar Aug 22 '22 14:08 t-hamano

Thank you! This PR definitely improved Tooltip's tests!

ciampo avatar Aug 22 '22 15:08 ciampo