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The same test passes on my machine every time and fails in CI a few times a week, for no reason I can find.
What you'll have at the end
The same test passing the same way ten times in a row, locally and in CI
You need
A Vitest and Testing Library suite already running in CI, with one test that fails there every so often while passing every time you run it yourself.
Not covered
Flakiness where the test genuinely still reaches a real network endpoint, or where an earlier test in the same file leaves shared mock state behind; those are different root causes with their own fix.
Leans on
One slow test in the suite is still hitting the real network
when the same intermittent CI failure turns out to be a real network call the test never mocked, not a timing race against your own async update
Testing a debounced input without waiting out the real delay
when the async gap the test is racing is a debounce timer you control yourself, not a store write or other operation outside the test's own code
Checked 25 Aug 2026
Part of the Vitest Testing Framework cookbook