fix: replace setTimeout with queueMicrotask to prevent deadlock#571
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timdeschryver merged 1 commit intotesting-library:mainfrom Mar 11, 2026
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When using vitest, setTimeout is mocked and will only advance when instructed to do so. This never happens when used within the testing library, leaving tests deadlocked. We can avoid that using queueMicrotask, which is not affected by mocked time. closes testing-library#565
timdeschryver
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Mar 11, 2026
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@all-contributors please add @jonaskuske for code |
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I've put up a pull request to add @jonaskuske! 🎉 |
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🎉 This PR is included in version 19.1.1 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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@timdeschryver @jonaskuske can this please be backported to the branch of angular-testing-library that can be used in angular@20.x? I have a project not yet ready to update to angular 21 but I think we've been plagued by this bug for a while and want to confirm this resolves it for us. |
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When using vitest, setTimeout is mocked and will only advance when instructed to do so (unless using
vi.useFakeTimers({ shouldAdvanceTime: true }). This never happens when used within the testing library, leaving tests deadlocked. We can avoid that using queueMicrotask, which is not affected by mocked time.closes #565