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user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-144036.md

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# 2026-03-28 Q-004 Coverage Remediation Pass 24
## Scope
- Continue strict `Q-004` closure work after Pass 23.
- Fully close the breadcrumb-hook hotspot in:
- `frontend/admin/src/lib/hooks/useBreadcrumbs.ts`
- Re-verify closure through targeted hook tests and full frontend validation.
## Changes
### Frontend
- Refined the hook implementation in:
- `frontend/admin/src/lib/hooks/useBreadcrumbs.ts`
- Removed redundant parent-injection logic that was dead under the current route model and added closure-grade tests in:
- `frontend/admin/src/lib/hooks/useBreadcrumbs.test.tsx`
- Newly verified behavior includes:
- root-path empty breadcrumb output
- single-segment terminal breadcrumb output
- nested breadcrumb output for known child routes
- skipping unknown route segments while retaining known ancestors
### Backend
- No backend code changes were required in this pass.
## Verified Commands
```powershell
cd D:\project\frontend\admin
npm.cmd run test:run -- src/lib/hooks/useBreadcrumbs.test.tsx
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage
```
## Results
### Frontend coverage
- Overall:
- statements `93.84%`
- branches `82.29%`
- functions `91.21%`
- lines `94.01%`
- Target area:
- `src/lib/hooks/useBreadcrumbs.ts`: statements `100%`, branches `100%`, functions `100%`, lines `100%`
### Validation outcomes
- Targeted hook validation passed:
- `1` passing test file
- `4` passing tests
- Full frontend coverage run now completes with:
- `53` passing test files
- `247` passing tests
- The required sequential frontend validation path passed:
- `test:run -- src/lib/hooks/useBreadcrumbs.test.tsx`
- `lint`
- `build`
- `test:coverage`
## Validation Notes
- The successful frontend coverage run still emits post-summary jsdom `AggregateError` network-noise lines.
- The command exits with code `0`.
- This remains a real validation-hygiene issue and cannot be hidden or described as a fully clean run.
## Real Conclusion
- `src/lib/hooks/useBreadcrumbs.ts` is no longer an open `Q-004` gap.
- `Q-004` still cannot be honestly declared closed.
- After this pass, the remaining higher-value frontend gaps narrow further to:
- `src/app/providers/ThemeProvider.tsx`
- the post-summary jsdom `AggregateError` coverage-noise hygiene issue