Add test file

[yangu61]

What this PR does

Kind of change

• New lesson
• Fix to an existing lesson
• Translation
• New output (prompt, skill, agent, MCP server)
• Docs / website / tooling

Checklist

• Code runs without errors with the listed dependencies
• No comments in code files (docs explain, code is self-explanatory)
• Built from scratch first, then shown with a framework (for new lessons)
• Lesson folder matches LESSON_TEMPLATE.md structure
• ROADMAP.md row for the lesson is a markdown link ([Name](phases/...)), not bare text
• One lesson per commit (atomic per-lesson rule)
• Tested locally / code output matches what docs/en.md claims

Phase / lesson

Notes for reviewer

[coderabbitai]

Important

Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (1)

• test.txt

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 30f57e28-57c4-492f-a350-546f109087bb

📥 Commits

Reviewing files that changed from the base of the PR and between 1cd3696 and bdcda8b.

📒 Files selected for processing (1)

• test.txt

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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