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alexcarpenter merged 2 commits into from
Oct 5, 2026
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docs(repo): colocate Mosaic feature tests with their component #10076

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docs(repo): colocate Mosaic feature tests with their component
alexcarpenter Oct 5, 2026
8e302b9
Merge branch 'main' into alex/mosaic-colocate-feature-tests
alexcarpenter Oct 5, 2026
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2 changes: 2 additions & 0 deletions .changeset/mosaic-colocate-feature-tests.md
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8 changes: 8 additions & 0 deletions .claude/skills/mosaic/references/testing.md
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Expand Up @@ -100,6 +100,14 @@ it('makes the selected organization active and closes', async () => {
`packages/mosaic/src/features/user-button/__tests__/user-button.feature.test.tsx`
is the worked example.

Put a feature test next to the component it renders, and name it after that
component. `<UserProfilePasswordSection />` is tested by
`user-profile-password-section/user-profile-password-section.feature.test.tsx`.
Vitest finds feature tests by the `.feature.test.tsx` suffix, so a shared
`__tests__/` folder buys nothing and makes a section's tests harder to find.
Existing tests in `__tests__/` folders, the worked example included, move when
their feature next changes.

### The toolkit (`src/__tests__/feature/`)

- **`fapi.ts`**: typed builders for FAPI JSON (`fapiEnvironment`, `fapiUser`,
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