docs(repo): colocate Mosaic feature tests with their component

[alexcarpenter]

Description

The Mosaic testing guide now says to put a feature test next to the component it renders and to name it after that component. For example, <UserProfilePasswordSection /> is tested by user-profile-password-section/user-profile-password-section.feature.test.tsx.

Vitest finds feature tests by their .feature.test.tsx suffix, so the shared __tests__/ folders aren't needed. They also make it hard to find a section's tests: features/user-profile/__tests__/ has about 49 files. Existing tests in __tests__/ folders move the next time their feature changes. They aren't moved in this PR.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Latest commit: 8e302b9

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Reviewing files that changed from the base of the PR and between 55a1d5b and 0352918.

📒 Files selected for processing (2)

• .changeset/mosaic-colocate-feature-tests.md
• .claude/skills/mosaic/references/testing.md

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• clerk/clerk_go (manual)
• clerk/dashboard (manual)
• clerk/accounts (manual)
• clerk/backoffice (manual)
• clerk/clerk (manual)
• clerk/clerk-docs (manual)
• clerk/cloudflare-workers (manual)
• clerk/clerk-ios (auto-detected)
• clerk/clerk-android (auto-detected)
• clerk/cli (auto-detected)

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📝 Walkthrough

Walkthrough

The testing guidance now says to place each feature test beside the component it renders and name it after that component. It identifies the .feature.test.tsx discovery suffix and recommends moving tests from shared __tests__/ folders when their feature next changes. The changeset file contains an empty frontmatter block.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: ephem

Merge Risk: ⚪ Minimal · up to 03529

The feature-test guidance matches the configured test discovery, and the empty changeset does not disrupt release status. No actionable merge risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating the Mosaic guide to colocate feature tests with their components.
Description check	✅ Passed	The description explains the test placement guidance, Vitest discovery, and the plan for existing tests. It is related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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commit: 8e302b9