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[RNMobile] Mock Date.now when using Jest's fake timers to allow debounce to be executed #50784

Merged
merged 2 commits into from
May 24, 2023
Merged

[RNMobile] Mock Date.now when using Jest's fake timers to allow debounce to be executed #50784

merged 2 commits into from
May 24, 2023

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fluiddot
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What?

Mock Date.now when using Jest's fake timers to allow debounce to be executed.

Why?

In integration tests, if a component uses the debounce function, the debounced function never gets triggered. This PR solves this issue.

How?

debounce relies on the time returned by Date.now to calculate the expiration of the timer:

gutenberg/packages/compose/src/utils/debounce/index.ts

Lines 192 to 200 in ce29b86

function timerExpired() {
const time = Date.now();
if ( shouldInvoke( time ) ) {
return trailingEdge( time );
}
// Restart the timer.
startTimer( timerExpired, remainingWait( time ) );
return undefined;
}

However, Date.now is returning the real-time even when using fake timers. To avoid this, Date.now is mocked when using the withFakeTimers test helper that enables/disables the fake timers.

Testing Instructions

  1. Run the command npm run native test.
  2. Observe that all tests pass.

Testing Instructions for Keyboard

N/A

Screenshots or screencast

N/A

@fluiddot fluiddot added the Mobile App - i.e. Android or iOS Native mobile impl of the block editor. (Note: used in scripts, ping mobile folks to change) label May 19, 2023
@fluiddot fluiddot self-assigned this May 19, 2023
@fluiddot fluiddot force-pushed the rnmobile/update/fake-timers-mock-date-now branch from 4df2773 to 51ea959 Compare May 19, 2023 12:23
@fluiddot fluiddot force-pushed the rnmobile/update/fake-timers-mock-date-now branch from 51ea959 to e418386 Compare May 19, 2023 12:25
@fluiddot fluiddot marked this pull request as ready for review May 19, 2023 12:25
@fluiddot fluiddot requested review from dcalhoun and SiobhyB May 19, 2023 12:25
This was referenced May 19, 2023
Closed
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github-actions bot commented May 19, 2023 •
edited
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Size Change: 0 B

Total Size: 1.4 MB

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SiobhyB approved these changes May 19, 2023
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Thanks so much for identifying this issue and working on the fix, @fluiddot! It works perfectly for me. 👏 🙇‍♀️

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github-actions bot commented May 19, 2023 •
edited
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Flaky tests detected in f592b14.
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/5026453837
📝 Reported issues:

@fluiddot fluiddot merged commit 04f0982 into trunk May 24, 2023
@fluiddot fluiddot deleted the rnmobile/update/fake-timers-mock-date-now branch May 24, 2023 14:14
@github-actions github-actions bot added this to the Gutenberg 15.9 milestone May 24, 2023
@twstokes twstokes mentioned this pull request May 31, 2023
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