vitest-dev / vitest-dev/vitest
Inexplicable and flaky userEvent action timeouts
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Description
Describe the bug
Since the version 3.1.2, some tests became flaky: userEvent (from @vitest/browser/context) actions lead to unexpected timeout errors.
These tests used to work in 3.1.1, the call logs do not reveal any issues, the screenshots look good, the actions should work, it's really inexplicable why these timeout errors start happening.
I cannot reproduce these errors at all locally, it's only happening in our CI, no clue why.
Here's a couple examples below:
TimeoutError: locator.hover: Timeout 581ms exceeded.
Call log:
- waiting for locator('[data-vitest="true"]').contentFrame().locator('body')
- locator resolved to <body>…</body>
- attempting hover action
- waiting for element to be visible and stable
- element is visible and stable
- scrolling into view if needed
- done scrolling
It says "Timeout 581ms exceeded", but it's not like we set an explicit 581ms timeout limit, really odd.
TimeoutError: frame.dragAndDrop: Timeout 10000ms exceeded.
Call log:
- waiting for locator('div:nth-child(4) > .dragIconClassname_d1f2l6jt')
Here setting a 10s timeout limit, and it's still exceeded, even though it should pass/not timeout.
TimeoutError: locator.hover: Timeout 5000ms exceeded.
Call log:
- waiting for locator('[data-vitest="true"]').contentFrame().locator('body')
- locator resolved to <body>↵ ↵↵</body>
- attempting hover action
- waiting for element to be visible and stable
- element is visible and stable
- scrolling into view if needed
- done scrolling
TimeoutError: locator.hover: Timeout 5000ms exceeded.
Call log:
- waiting for locator('[data-vitest="true"]').contentFrame().locator('body')
- locator resolved to <body>…</body>
- attempting hover action
- waiting for element to be visible and stable
Reproduction
A simple
await userEvent.hover(document.body, { position: { x: 0, y: 0 } });
can timeout in our CI since 3.1.2.
This is with the playwright provider.
System Info
System:
OS: Windows 11 10.0.26100
CPU: (32) x64 AMD Ryzen 9 9950X3D 16-Core Processor
Memory: 36.50 GB / 63.58 GB
Binaries:
Node: 23.11.0 - C:\Program Files\nodejs\node.EXE
npm: 11.3.0 - C:\Program Files\nodejs\npm.CMD
Browsers:
Edge: Chromium (131.0.2903.99)
npmPackages:
@vitejs/plugin-react: ^4.4.1 => 4.4.1
@vitest/browser: ^3.1.2 => 3.1.2
@vitest/coverage-v8: ^3.1.2 => 3.1.2
playwright: ~1.52.0 => 1.52.0
vite: ^6.3.2 => 6.3.2
vitest: ^3.1.2 => 3.1.2
vitest-browser-react: ^0.1.1 => 0.1.1
Used Package Manager
npm
Validations
- Follow our Code of Conduct
- Read the Contributing Guidelines.
- Read the docs.
- Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
- Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
- The provided reproduction is a minimal reproducible example of the bug.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the minimal userEvent.hover reproduction using the Playwright provider and compare behavior between versions 3.1.1 and 3.1.2. Trace the timeout handling for browser userEvent actions, including hover and dragAndDrop, and verify that the CI reproduction completes reliably without unexpected timeouts.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- playwright, typescript
- Domain
- testing-qa
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100