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user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-123228.md

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# 2026-03-28 Q-004 Coverage Remediation Pass 18
## Scope
- Continue strict `Q-004` closure work after Pass 17.
- Fully close the remaining shared page-state hotspot in:
- `frontend/admin/src/components/feedback/PageState/PageState.tsx`
- Re-verify closure through targeted component tests and full frontend validation.
## Changes
### Frontend
- Added dedicated page-state coverage in:
- `frontend/admin/src/components/feedback/PageState/PageState.test.tsx`
- Newly covered behavior includes:
- `PageLoading` default and custom tips
- `PageEmpty` without action
- `PageEmpty` with action button and click handling
- `PageError` default rendering
- `PageError` retry and extra-action rendering
### Backend
- No backend code changes were required in this pass.
## Verified Commands
```powershell
cd D:\project\frontend\admin
npm.cmd run test:run -- src/components/feedback/PageState/PageState.test.tsx
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage
```
## Results
### Frontend coverage
- Overall:
- statements `91.71%`
- branches `78.52%`
- functions `88.01%`
- lines `91.86%`
- Target area:
- `src/components/feedback/PageState/PageState.tsx`: statements `100%`, branches `100%`, functions `100%`, lines `100%`
### Validation outcomes
- Full frontend coverage run now completes with:
- `49` passing test files
- `223` passing tests
- The required sequential frontend validation path passed:
- `test:run -- src/components/feedback/PageState/PageState.test.tsx`
- `lint`
- `build`
- `test:coverage`
## Validation Notes
- The successful frontend coverage run still emits one post-summary jsdom `AggregateError` network-noise line.
- It does not fail the command.
- It remains a real validation-hygiene issue and cannot be hidden.
## Real Conclusion
- `src/components/feedback/PageState/PageState.tsx` 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/layouts/AdminLayout/AdminLayout.tsx`
- `src/pages/admin/ImportExportPage/ImportExportPage.tsx`
- `src/lib/errors/AppError.ts`
- `src/lib/storage/token-storage.ts`
- the post-summary jsdom `AggregateError` coverage-noise hygiene issue