Fix lazy import error from jest and Appearance.js #47629
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we can either mock https://github.com/facebook/react-native/blob/9a60038a40e16925ea1adeb3e3c937c22a615485/packages/react-native/Libraries/Utilities/Appearance.js. but that feels more complex to mock |
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@huntie has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator. |
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Thanks for the fix. Can you also add a Jest unit test that would fail without this fix? |
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This pull request was successfully merged by @Kudo in ce838a4 When will my fix make it into a release? | How to file a pick request? |
@yungsters will try that in a separate pr. thanks! |
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Summary: add a jest test to test when `useColorScheme` is not mocked. following up #47629 (comment) ## Changelog: [GENERAL] [ADDED] - Add useColorScheme mock test Pull Request resolved: #47988 Test Plan: ci passed Reviewed By: javache Differential Revision: D66573172 Pulled By: blakef fbshipit-source-id: 820227f6fc4e18a968b3181fad8f534a716f1e9e
blakef
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Dec 4, 2024
Summary:
currently running jest test, it shows an error:
```
ReferenceError: You are trying to `import` a file after the Jest environment has been torn down. From __tests__/App.test.tsx.
at getState (node_modules/react-native/Libraries/Utilities/Appearance.js:18:26)
at addChangeListener (node_modules/react-native/Libraries/Utilities/Appearance.js:71:19)
at subscribe (node_modules/react-native/Libraries/Utilities/useColorScheme.js:10:66)
at subscribeToStore (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6232:10)
at commitHookEffectListMount (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:13038:26)
at commitPassiveMountOnFiber (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:14461:11)
at commitPassiveMountEffects_complete (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:14421:9)
at commitPassiveMountEffects_begin (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:14408:7)
at commitPassiveMountEffects (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:14396:3)
at flushPassiveEffectsImpl (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:16287:3)
at flushPassiveEffects (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:16236:14)
at node_modules/react-test-renderer/cjs/react-test-renderer.development.js:16051:9
at workLoop (node_modules/scheduler/cjs/scheduler.development.js:266:34)
at flushWork (node_modules/scheduler/cjs/scheduler.development.js:239:14)
at Immediate.performWorkUntilDeadline [as _onImmediate] (node_modules/scheduler/cjs/scheduler.development.js:533:21)
```
it is a regression from #46123 that to have a lazy require.
this pr tries to mock `useColorScheme` to return `light`. i think we don't necessarily test the color scheme changes in jest runtime. originally `useColorScheme` also returns `light` because of [this statement](https://github.com/facebook/react-native/blob/9a60038a40e16925ea1adeb3e3c937c22a615485/packages/react-native/Libraries/Utilities/Appearance.js#L77-L83)
## Changelog:
[GENERAL] [FIXED] - Fixed jest error from Appearance.js
Pull Request resolved: #47629
Test Plan:
```sh
$ npx react-native-community/cli init RN0762 --pm bun --version 0.76.2
$ cd RN0762
$ bun test run
```
Reviewed By: cipolleschi
Differential Revision: D66297456
Pulled By: huntie
fbshipit-source-id: 80d1460532e76bd1815c66964547b50d7f7b3558
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Summary:
currently running jest test, it shows an error:
it is a regression from #46123 that to have a lazy require.
this pr tries to mock
useColorSchemeto returnlight. i think we don't necessarily test the color scheme changes in jest runtime. originallyuseColorSchemealso returnslightbecause of this statementChangelog:
[GENERAL] [FIXED] - Fixed jest error from Appearance.js
Test Plan: