docs: Add testing guidance to CLAUDE.md

[MH4GF]

Issue

• resolve: (none - documentation improvement)

Why is this change needed?

Add reference to test-principles.md in CLAUDE.md to ensure Claude Code follows established testing principles when writing tests.

Summary

• Added Testing section to CLAUDE.md that references @docs/test-principles.md

Test plan

• Verify CLAUDE.md renders correctly
• Confirm @docs/test-principles.md reference works in Claude Code

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Expanded CSS/Testing guidance with a new Testing subsection that references established test principles for consistency.
  • Clarifies expectations for testing approaches without altering application behavior.
  • No functional, UI, or performance changes; user experience remains unchanged.

[vercel]

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[giselles-ai]

Unexpected error on running flow

Step	Status	Updated(UTC)
1	✅	Oct 10, 2025 9:56am
2	✅	Oct 10, 2025 9:58am
3	❌	Oct 10, 2025 9:58am

[supabase]

Updates to Preview Branch (chore-claude-md-6) ↗︎

Deployments	Status	Updated
Database	✅	Fri, 10 Oct 2025 09:59:41 UTC
Services	✅	Fri, 10 Oct 2025 09:59:41 UTC
APIs	✅	Fri, 10 Oct 2025 09:59:41 UTC

Tasks are run on every commit but only new migration files are pushed.
Close and reopen this PR if you want to apply changes from existing seed or migration files.

Tasks	Status	Updated
Configurations	✅	Fri, 10 Oct 2025 09:59:46 UTC
Migrations	✅	Fri, 10 Oct 2025 09:59:49 UTC
Seeding	✅	Fri, 10 Oct 2025 09:59:51 UTC
Edge Functions	✅	Fri, 10 Oct 2025 09:59:51 UTC

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[coderabbitai]

Walkthrough

Adds a Testing subsection to CLAUDE.md under CSS/Testing guidance, directing readers to follow principles in docs/test-principles.md. No code or control flow changes.

Changes

Cohort / File(s)	Summary of changes
Documentation CLAUDE.md	Added a Testing subsection under CSS/Testing, referencing docs/test-principles.md.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Add practical testing guidelines to test principles #3324 — Updates docs/test-principles.md, which is directly referenced by the new CLAUDE.md subsection.
• 📝(test): Add test principles documentation and Claude test commands #2305 — Introduces docs/test-principles.md that the CLAUDE.md Testing subsection depends on.

Suggested labels

Review effort 2/5

Suggested reviewers

• hoshinotsuyoshi
• FunamaYukina
• NoritakaIkeda
• junkisai

Poem

A nibble of docs, a hop through the grass,
I annotate trails where testers will pass.
Follow the scroll to principles true—
Carrots of wisdom for CSS crew.
Thump-thump! I approve this guiding class. 🥕🐇

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title succinctly and accurately describes the main documentation change by specifying that testing guidance is being added to CLAUDE.md, making it clear and specific for reviewers scanning the history.
Description Check	✅ Passed	The description includes the required “## Issue” section with a resolve entry and the “## Why is this change needed?” section with a clear justification, and it further provides a summary and test plan to guide reviewers and ensure documentation quality.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore-claude-md-6

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[giselles-ai]

Check changeset necessity

Status: NOT REQUIRED

Reason:

• This PR modifies documentation only (CLAUDE.md) and does not touch any published package code.
• No changes in target packages: @liam-hq/cli, @liam-hq/erd-core, @liam-hq/schema, or @liam-hq/ui.
• No user-facing behavior, API, feature, or performance changes are introduced.
• Falls under “Comments or documentation only” in Non-user-facing changes; even the referenced docs path (@liam-hq/docs) is on the ignore list.

Changeset (copy & paste):

N/A – docs-only change; do not create a changeset.

[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

CLAUDE.md (1)

114-117: Add a Markdown link alongside the @ reference

- - Follow principles in @docs/test-principles.md
+ - Follow principles in @docs/test-principles.md ([Testing principles](docs/test-principles.md))

📜 Review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 227ab97 and 2a81fc9.

📒 Files selected for processing (1)

• CLAUDE.md (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: _e2e-tests (Mobile Safari)
• GitHub Check: security-review
• GitHub Check: Supabase Preview

[Copilot]

Pull Request Overview

This PR adds testing guidance to the CLAUDE.md documentation file to ensure Claude Code follows established testing principles when writing tests.

• Added a new Testing section that references the established test principles documentation

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