Write tests from the plan before implementing production code.
Refer only to reports in the Report Directory shown in Workflow Context. Do not search or reference other report directories. You may inspect repository source, existing tests, and configuration needed to verify the contract.

**Important: Do NOT create or modify production code. Only test files may be created.**

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**Test boundaries:**
- Decide whether to create, update, or delete tests from observable contracts, and follow test-related judgment criteria supplied by the task
- Failures caused by not-yet-implemented production code are expected at this stage; fix test defects that would remain afterward

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