# Testing Review Report

**Branch**: feat/186-query-engine -> main
**Date**: 2026-05-18
**Scope**: Incremental (4 commits since last review)

## Issues in Your Changes (BLOCKING)

### MEDIUM

**Delegation test does not verify 3 of 7 SearchQuery fields** - `query_tests.rs:207-235`
**Confidence**: 90%
- Problem: `test_search_delegates_to_inner_layer` asserts that `text`, `lang`, `limit`, and `offset` are forwarded unchanged, but omits `ast_pattern`, `temporal_flags`, and `bm25f_config`. The stated purpose of this test ("QueryEngine must forward the exact query unchanged") implies all fields should be verified. A future regression could silently drop or mutate one of the unchecked fields without test failure.
- Fix: Add assertions for the three missing fields:
```rust
assert_eq!(
    received.ast_pattern, original_query.ast_pattern,
    "QueryEngine must forward the ast_pattern unchanged"
);
assert_eq!(
    received.temporal_flags, original_query.temporal_flags,
    "QueryEngine must forward temporal_flags unchanged"
);
// bm25f_config contains f32 so no PartialEq -- use Debug comparison:
assert_eq!(
    format!("{:?}", received.bm25f_config),
    format!("{:?}", original_query.bm25f_config),
    "QueryEngine must forward bm25f_config unchanged"
);
```

## Issues in Code You Touched (Should Fix)

(none)

## Pre-existing Issues (Not Blocking)

(none)

## Suggestions (Lower Confidence)

- **Oversized-query short-circuit not proven with PanicLayer** - `query_tests.rs:106-117` (Confidence: 65%) -- `test_oversized_query_returns_invalid_query_error` uses a real inner layer via `build_query_engine`. A PanicLayer would prove the oversized path short-circuits, matching the pattern established for empty queries. Low priority since the error return is validated and the inner layer is never reached on the error path regardless.

- **SpyLayer delegation test only exercises None-valued optional fields** - `query_tests.rs:213` (Confidence: 70%) -- `SearchQuery::new("processEvent")` leaves `ast_pattern`, `temporal_flags`, `bm25f_config`, `lang`, `limit`, and `offset` as `None`. A second delegation test exercising populated optional fields would prove they pass through when set, not just when defaulted.

## Summary

| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 0 | 1 | 0 |
| Should Fix | 0 | 0 | 0 | 0 |
| Pre-existing | 0 | 0 | 0 | 0 |

**Testing Score**: 8/10
**Recommendation**: APPROVED_WITH_CONDITIONS

The test suite is well-structured and demonstrates strong testing practices:
- Proper test double taxonomy (SpyLayer as spy, PanicLayer as assertion-by-panic) with clear documentation of each double's purpose.
- Good AAA (Arrange-Act-Assert) structure throughout.
- Tests validate behavior, not implementation -- the shift from matching error enum variants to asserting on Display output is a positive change.
- PanicLayer proves short-circuit semantics (inner layer never called) rather than just checking return values.
- Edge cases covered well: NaN, Infinity, NEG_INFINITY, exact boundary, unicode, whitespace, single-char, pagination.
- The pagination test was correctly hardened from a silent `return` to an explicit assertion.

The one blocking MEDIUM is the incomplete field coverage in the delegation test -- three `SearchQuery` fields are not verified. This is a straightforward fix that completes the test's stated contract.
