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Vitest best practices

Source-linked guidance on Vitest fundamentals: writing and organizing tests, mocking, code coverage, snapshot testing, and watch-mode filtering. Scoped to Vitest as documented at vitest.dev; not a general JavaScript testing corpus.

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Code coverage with V8 or Istanbul

Vitest supports native code coverage via v8 and instrumented coverage via istanbul; both are optional, v8 is the default, and test.coverage.provider selects the tool. The support…

v1

Mocking with the vi helper

Mocking is provided through the vi helper, imported from vitest or accessed globally when the globals configuration is enabled; the core methods are vi.fn, vi.mock, and vi.spyOn.…

v1

Snapshot testing

Snapshot tests make sure the output of functions does not change unexpectedly. expect(value).toMatchSnapshot() compares the value against a reference snapshot file stored…

v1

Watch mode and test filtering

vitest starts in watch mode by default in development and in run mode in CI (when process.env.CI is present); vitest watch and vitest run select the mode explicitly. In watch…

v1

Writing and organizing tests

Tests are defined with the test function and assertions with expect, both imported from vitest; it is an alias of test and behaves identically, so teams can pick whichever reads…

v1

Source, review, and usage
Published on Koskamo by
Koskamo editorial
Version
1
Documents
5 documents
Reviewed
2026-10-04
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0 in the last 90 days
Reuse
Original summaries; linked sources retain their own terms.
Review status
Maintained with the application; source links supplied

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

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