---
phase: 50-code-quality-test-coverage
verified: 2026-04-14T12:06:19Z
status: passed
score: 6/6 must-haves verified
re_verification: false
---

# Phase 50: Code Quality & Test Coverage Verification Report

**Phase Goal:** Improve test coverage for untested modules, reduce code duplication, and introduce domain types for stronger compile-time guarantees
**Verified:** 2026-04-14T12:06:19Z
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | `expand/join_resolver.rs`, `expand/fan_trap.rs`, and `expand/facts.rs` each have unit tests covering normal paths and edge cases | VERIFIED | join_resolver.rs: 9 tests (#[cfg(test)] at line 205); fan_trap.rs: 13 tests (#[cfg(test)] at line 321); facts.rs: 22 tests (#[cfg(test)] at line 426) |
| 2 | Dimension/metric/fact resolution loops in `expand()` and `expand_facts()` are deduplicated into a shared generic helper | VERIFIED | `fn resolve_names<'a, T, N: AsRef<str>>` at sql_gen.rs:17; called at lines 71, 100, 292, 327; no `let mut seen_` variables remain |
| 3 | `DimensionName` and `MetricName` newtypes replace bare `String` in `QueryRequest` and resolution code, with case-insensitive comparison consolidated in one place | VERIFIED | types.rs:9,75 define structs with `PartialEq` using `eq_ignore_ascii_case`; QueryRequest at types.rs:145-146 uses `Vec<DimensionName>` and `Vec<MetricName>`; exported from mod.rs:19; table_function.rs:489,493 uses `DimensionName::new`/`MetricName::new`; expand_proptest.rs updated |
| 4 | Named `NaGroup` struct replaces tuple in `semi_additive.rs` | VERIFIED | `struct NaGroup` at semi_additive.rs:314 with fields `na_dims: Vec<NonAdditiveDim>` and `metric_indices: Vec<usize>`; `collect_na_groups` returns `Vec<NaGroup>` at line 327; no tuple `.0`/`.1` access patterns remain |
| 5 | Dead `parse_constraint_columns()` in `model.rs` is removed | VERIFIED | `parse_constraint_columns` absent from model.rs; `constraint_column_parsing_tests` module absent; `#[allow(dead_code)]` annotation absent |
| 6 | `sql_gen.rs` tests use structural property assertions instead of exact string equality where appropriate | VERIFIED | 1 golden anchor (`test_basic_single_dimension_single_metric` at line 571) retains `assert_eq!(sql, expected)`; 4 other tests converted to `assert!(sql.contains(...))` / `assert!(sql.starts_with(...))`; 18 property assertions total across converted tests |

**Score:** 6/6 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/expand/join_resolver.rs` | Unit test module for join resolution functions | VERIFIED | `#[cfg(test)]` at line 205; 9 test functions covering synthesize_on_clause (single, composite, empty, scoped alias, ref_columns preference, pk fallback) and resolve_joins_pkfk (no joins, single join, using relationship) |
| `src/expand/fan_trap.rs` | Unit test module for fan trap detection functions | VERIFIED | `#[cfg(test)]` at line 321; 13 test functions covering ancestors_to_root (3), check_fan_traps (6), validate_fact_table_path (4) |
| `src/expand/facts.rs` | Additional unit tests for fact helper functions | VERIFIED | `#[cfg(test)]` at line 426; 22 total tests (6 pre-existing + 16 new); covers collect_derived_metric_using, toposort_facts, inline_facts, collect_derived_metric_source_tables |
| `src/expand/sql_gen.rs` | resolve_names generic helper + property assertions | VERIFIED | `fn resolve_names` at line 17; 18 property assertion usages; 1 golden anchor preserved |
| `src/expand/types.rs` | DimensionName and MetricName newtypes, updated QueryRequest | VERIFIED | Both newtypes defined with case-insensitive PartialEq/Eq/Hash; QueryRequest uses Vec<DimensionName> and Vec<MetricName>; 7 newtype unit tests |
| `src/expand/semi_additive.rs` | NaGroup named struct | VERIFIED | `struct NaGroup` with `na_dims` and `metric_indices` fields; return type `Vec<NaGroup>` |
| `src/model.rs` | parse_constraint_columns removed | VERIFIED | Function, test module, and dead_code annotation all absent |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `join_resolver.rs` tests | `test_helpers.rs` | `TestFixtureExt` builder methods | WIRED | `use crate::expand::test_helpers::{orders_view, TestFixtureExt}` at line 208; `with_pkfk_join` called at lines 371, 399, 406 |
| `fan_trap.rs` tests | `test_helpers.rs` | `with_pkfk_join` builder | WIRED | `use crate::expand::test_helpers::{minimal_def, orders_view, TestFixtureExt}` at line 324; `with_pkfk_join` called at lines 370, 402, 431, 464 |
| `types.rs DimensionName` | `sql_gen.rs resolve_names` | `AsRef<str>` generic bound | WIRED | `resolve_names<'a, T, N: AsRef<str>>` accepts newtypes via `AsRef<str>` impl; DimensionName imported in sql_gen tests |
| `types.rs QueryRequest` | `table_function.rs` | `DimensionName::new` / `MetricName::new` | WIRED | `table_function.rs:489,493` uses `crate::expand::DimensionName::new` and `MetricName::new` to build QueryRequest |
| `expand/mod.rs` | `types.rs` newtypes | `pub use types::{DimensionName, MetricName}` | WIRED | mod.rs:19: `pub use types::{DimensionName, ExpandError, MetricName, QueryRequest}` |

### Data-Flow Trace (Level 4)

Not applicable — this phase adds unit tests and internal refactoring only. No user-facing rendering or data pipelines introduced.

### Behavioral Spot-Checks

| Behavior | Command | Result | Status |
|----------|---------|--------|--------|
| join_resolver tests all pass | `cargo test expand::join_resolver --lib` | 9 passed; 0 failed | PASS |
| fan_trap tests all pass | `cargo test expand::fan_trap --lib` | 13 passed; 0 failed | PASS |
| facts tests meet 22+ threshold | `cargo test expand::facts --lib` | 22 passed; 0 failed | PASS |
| sql_gen tests all pass (95 total) | `cargo test expand::sql_gen::tests --lib` | 95 passed; 0 failed | PASS |
| Full Rust unit test suite | `cargo test --lib` | 616 passed; 0 failed | PASS |

### Requirements Coverage

The QUAL-XX identifiers (QUAL-01 through QUAL-06) referenced in plan frontmatter are phase-internal quality goal identifiers defined in ROADMAP.md's success criteria for Phase 50. They correspond 1:1 to the 6 success criteria verified above. They are not tracked in REQUIREMENTS.md's v0.6.0 traceability table, which covers only product-facing requirements (META, ALT, SEMI, WIN, FACT, WILD, SHOW). This is by design — code quality goals are scoped to the phase, not to the product requirements register.

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| QUAL-01 | 50-01-PLAN.md | Unit tests for join_resolver, fan_trap, facts | SATISFIED | 9+13+22 tests verified passing |
| QUAL-06 | 50-01-PLAN.md | sql_gen property assertions | SATISFIED | 18 property assertions, 1 golden anchor retained |
| QUAL-02 | 50-02-PLAN.md | resolve_names deduplication | SATISFIED | `fn resolve_names` at sql_gen.rs:17, 4 call sites |
| QUAL-03 | 50-02-PLAN.md | DimensionName/MetricName newtypes | SATISFIED | types.rs defines both with case-insensitive Eq/Hash |
| QUAL-04 | 50-02-PLAN.md | NaGroup named struct | SATISFIED | struct NaGroup in semi_additive.rs:314 |
| QUAL-05 | 50-02-PLAN.md | Dead parse_constraint_columns removed | SATISFIED | Absent from model.rs |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| `src/expand/sql_gen.rs` | 3682 | Comment: "not yet implemented" | Info | Comment in a test describing test intent for a guard condition; not a stub implementation. No impact on goal. |

### Human Verification Required

None. All success criteria are programmatically verifiable.

### Gaps Summary

No gaps found. All 6 success criteria are fully satisfied:

1. Unit tests exist in all 3 target modules with coverage of normal paths and edge cases (empty inputs, circular dependencies, missing references per toposort cycle tests)
2. Resolution loop deduplication is complete — `resolve_names` generic helper eliminates all 4 duplicated patterns
3. DimensionName/MetricName newtypes are wired end-to-end from table_function.rs through QueryRequest into the resolution helper
4. NaGroup struct is in place with no residual tuple access patterns
5. Dead code is removed from model.rs with no remaining `#[allow(dead_code)]` annotations
6. sql_gen.rs tests use property assertions with exactly 1 golden anchor preserved

Full Rust unit test suite: 616 tests passing.

---

_Verified: 2026-04-14T12:06:19Z_
_Verifier: Claude (gsd-verifier)_
