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Use fake timers in DatePicker tests #40800

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Use fake timers in DatePicker tests #40800

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noisysocks
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What?

Switches the DatePicker unit tests to use fake timers in line with @ciampo's feedback in #40754 (comment).

Why?

How?

Testing Instructions

npm run test

Screenshots or screencast

@noisysocks noisysocks mentioned this pull request May 4, 2022
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This change results in this unexpected failure:

    Expected mock function not to be called but it was called with:
    ["Warning: `NaN` is an invalid value for the `%s` css style property.%s", "height", "
        at div
        at div
        at div
        at div
        at OutsideClickHandler (/Users/robert/projects/gutenberg/node_modules/react-outside-click-handler/build/OutsideClickHandler.js:68:5)
        at div
        at DayPicker (/Users/robert/projects/gutenberg/node_modules/react-dates/lib/components/DayPicker.js:287:5)
        at withStyles(DayPicker) (/Users/robert/projects/gutenberg/node_modules/react-with-styles/lib/withStyles.js:172:11)
        at DayPickerSingleDateController (/Users/robert/projects/gutenberg/node_modules/react-dates/lib/components/DayPickerSingleDateController.js:259:5)
        at div
        at DatePicker (/Users/robert/projects/gutenberg/packages/components/src/date-time/date.js:79:2)"]

I'm not quite sure what's going on. Assumedly OutsideClickHandler (used by react-dates) doesn't like using fake timers.

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github-actions bot commented May 4, 2022 •
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Size Change: 0 B

Total Size: 1.24 MB

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Base automatically changed from add/more-DatePicker-tests to trunk May 4, 2022 06:35
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ciampo commented May 5, 2022

Mhh, that's unexpected. Let's merge #40801 first, rebase on trunk and see if the problem persists.

@ciampo ciampo added [Type] Automated Testing Testing infrastructure changes impacting the execution of end-to-end (E2E) and/or unit tests. [Type] Code Quality Issues or PRs that relate to code quality [Package] Components /packages/components labels May 5, 2022
@noisysocks noisysocks force-pushed the try/use-fake-timers-in-DatePicker-tests branch from e73646c to 8751914 Compare May 9, 2022 01:56
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Done 🤞

@ciampo
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ciampo commented May 9, 2022 •
edited
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Tests are still failing, and so I looked a bit more into what could be the reason:

Previously, not using fake timers made it so that these functions were not run (probably the expect assertion happened before them).

Not sure if there's a way to fix this on our end.

We could open an issue in the react-dates repository, and in the meantime:

  • either use fake timers for all tests BUT this specific failing test (and leave a comment why?);
  • or put this PR on pause until we hear back from react-dates folks

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noisysocks commented May 10, 2022 •
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Nice sleuthing! 🕵️

  • but those properties don't seem to be defined on that style object.

Hm, is this because it's not a real DOM? I think we'd need to reproduce the issue in a real browser before opening a bug report.

I'm getting pretty far away from my main objective 😅 so I'll put this on the backburner for now.

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ciampo commented May 10, 2022

Yes, it could well be caused by how the getComputedStyle function works in the jest-dom environment.

Let's save this for a rainy day

@noisysocks noisysocks closed this Jun 8, 2022
@noisysocks noisysocks deleted the try/use-fake-timers-in-DatePicker-tests branch June 8, 2022 07:14
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