# Code Review — TP-087 Step 3: Tests

## Verdict: APPROVE

The Step 3 changes add focused coverage for the `internal/analysis` metric parser, schema helper, metadata helpers, and invalid-error contract. The tests cover the regressions called out in prior reviews, including canonical `_per_` metrics round-tripping before expression rejection.

## Findings

No blocking findings.

## Notes

- Targeted verification passed locally: `go test -count=1 ./internal/analysis`.
- The schema assertions intentionally compare the enum to `MetricValues()` rather than duplicating the complete catalog, which keeps the test maintainable while still checking canonical-only values and alias exclusion.
- The metadata helper tests cover representative multi-source, derived, subjective-scale, and defensive-copy behavior. Future work could make `ValidateMetricCatalog` assert source descriptor completeness, but that is not required to approve this test step.
