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useSelect: add unit tests for static select mode #46606

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merged 3 commits into from
Dec 16, 2022

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@jsnajdr jsnajdr commented Dec 16, 2022

When working on new useSelect implementation in #46538 I discovered we don't have any unit tests for the "static select mode", i.e., using useSelect in a non-reactive way, typically to read the latest value in an event handler:

const { getStuff } = useSelect( blockEditorStore );
const handleClick = () => {
  console.log( 'latest stuff is:', getStuff() );
}

This PR fixes that omission. There is a new test that passes with the old useSelect, and will also pass with the new useSelect in #46538. Test-driven development!

@jsnajdr jsnajdr added the [Package] Data /packages/data label Dec 16, 2022
@jsnajdr jsnajdr self-assigned this Dec 16, 2022
@jsnajdr jsnajdr requested a review from nerrad as a code owner December 16, 2022 09:25
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Size Change: +7 B (0%)

Total Size: 1.32 MB

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LGTM 👍 Thanks!

I hope you don't mind I used the opportunity to refactor fireEvent usage to user-event.

🚀

@jsnajdr
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jsnajdr commented Dec 16, 2022

I hope you don't mind I used the opportunity to refactor fireEvent usage to user-event.

I actually do mind in this particular case 🙂 These are very low-level tests, some of them try to reproduce precise timing of events -- like a store update between render and effect -- and I don't want any awaits and timeouts there. fireEvent is more appropriate here: it dispatches exactly one event, synchronously, wrapped with act(), and nothing more. We are not testing UI here.

Can you please revert the commit?

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tyxla commented Dec 16, 2022

I tend to disagree because while I understand your rationale, I consider the fireEvent use a "this is never going to happen" scenario since a user click will always behave like userEvent.click() and not fireEvent.click(). Happy to revert though.

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jsnajdr commented Dec 16, 2022

I consider the fireEvent use a "this is never going to happen" scenario

That's true, in a realistic UI a click wouldn't happen this way but for this particular test suite it's not relevant. We're doing the clicks just as an easy way to trigger something inside the component. Doing a state update, or calling a function returned from a hook.

We could achieve the goal also by assigning the setChildShouldDispatch or get functions to variables outside the component and then calling them. Maybe that would be less confusing? Like:

let innerSetFoo;
function TestComponent() {
  const [ foo, setFoo ] = useState( 'foo' );
  innerSetFoo = setFoo;
  return <div>{ foo }</div>;
}
render( <TestComponent /> );
expect( screen ).toHaveTextContent( 'foo' );
act( () => innerSetFoo( 'bar' ) );
expect( screen ).toHaveTextContent( 'bar' );

@jsnajdr jsnajdr merged commit cd8451d into trunk Dec 16, 2022
@jsnajdr jsnajdr deleted the add/use-select-static-tests branch December 16, 2022 12:12
@github-actions github-actions bot added this to the Gutenberg 14.9 milestone Dec 16, 2022
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