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Add test for useConstrainedTabbing #48736

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@afercia afercia commented Mar 3, 2023

Fixes #47427

What?

This PR seeks to add tests for useConstrainedTabbing.

For now, it's a draft as I'm unclear how to solve some issues. I'd greatly appreciate any jelp and feedback. Cc @ellatrix

  • Looks like the React testing Library didn't implement event.keycode so I had to change the hook to use event.code.
  • I'm not sure how to assert that after the trap element is focused and then blurred, the actual focus goes to the first tabbable element within the node.
  • The plan is: first complete the test above.
  • Then, add a test to check the behavior is correct when tabbing backwards.
  • Finally, add a test to cover the specific use case from useConstrainedTabbing steals focus from elements with tabindex="-1" #34681.

Why?

Right now, there's no unit tests for useConstrainedTabbing. Such an important component should have at least some basic tests.

How?

Add tests.

Testing Instructions

Run the test: npm run test:unit -- --testPathPattern packages/compose/src/hooks/use-constrained-tabbing/test/index.js

Testing Instructions for Keyboard

Screenshots or screencast

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afercia commented Mar 3, 2023

Note: in the next days I won't be able to do any work on this. If anyone has time and passion for testing, please do feel free to go ahead and make this PR yours. ❤️

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Size Change: +881 B (0%)

Total Size: 1.34 MB

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github-actions bot commented Mar 3, 2023

Flaky tests detected in 5873b77.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4499234811
📝 Reported issues:

@afercia afercia force-pushed the add/use-constrained-tabbing-test branch from 08e90b0 to 3265482 Compare March 20, 2023 13:34
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afercia commented Mar 23, 2023

I'm having some troubles to test this and would greatly appreciate some help. Cc @ellatrix

To my understanding, due to the particular implementation of useConstrainedTabbing, some important things happen while the Tab key is pressed. Specifically:

  • The trap element is created and focused immediately on the keydown event.
  • After that, useConstrainedTabbing expects the native browser behavior to kick in and let the Tan key press do its job: move focus to the first (or last) tabbable element within the constrained node.

The above logic appears to be a bit hard to test. To my understanding it's in part a timing issue and in part because of the way the React testing library userEvent works:

  • Using await user.tab(): at that point it's too late. Some code that is supposed to run while the Tab key behavior occurs actually doesn't run.
  • Using user.tab() without await: it's too early. Focus hasn't moved yet.
  • Using fireEvent.keyDown( component, { code: 'Tab' } ): this makes the code logic work as expected but it doesn't really navigate with the Tab key.

I'm not that familiar with the React testing library and I'm out of ideas. Not sure how to make these tests work. Any help is very welcome.

On a related note, i'd like to stress the importance of testing useConstrainedTabbing reliably. It already broke a few times. If the current implementation proves to not be easily testable, I'd tend to think the component should be refactored.

@afercia afercia requested a review from ellatrix April 12, 2023 10:23
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afercia commented Aug 30, 2023

I would need some help to check if the current code is actually testable. @Mamaduka not sure if you have some time but I'd greatly appreciate your help, is possible 🙏 See my last comment: #48736 (comment)

If the current implementation of useConstrainedTabbing proves to be not testable for the reasons explained in the commet above, I'd argue that the this componet would need a different approach.

@Mamaduka Mamaduka self-requested a review August 30, 2023 11:50
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Thanks for the ping, @afercia! I am adding this to my todo list and will try to provide feedback at the end of this week or early next.

@Mamaduka Mamaduka added [Type] Enhancement A suggestion for improvement. [Package] Compose /packages/compose labels Aug 30, 2023
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Add unit tests for useConstrainedTabbing
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