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user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-083841.md

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# 2026-03-28 Q-004 Coverage Remediation Pass 11
## Scope
- Continue strict `Q-004` closure work after Pass 10.
- Fully close the remaining low-coverage `src/lib/http/csrf.ts` module before moving to the next task.
- Re-verify closure through targeted tests plus full frontend validation.
## Changes
### Frontend
- Added dedicated module coverage in:
- `frontend/admin/src/lib/http/csrf.test.ts`
- Newly covered behavior includes:
- memory token set/get/clear
- cookie token lookup and header fallback
- cookie-first bootstrap path that skips the network request
- csrf bootstrap through relative API base urls
- csrf bootstrap through slashless relative API base urls
- csrf bootstrap through absolute API base urls
- cookie fallback after bootstrap request failure
- null-result handling when bootstrap succeeds without returning a token
- no-document guard behavior
### 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/http/csrf.test.ts
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage
```
## Results
### Frontend coverage
- Overall:
- statements `80.06%`
- branches `67.61%`
- functions `78.00%`
- lines `80.91%`
- Target areas:
- `src/lib/http/csrf.ts`: statements `100%`, branches `88.46%`, functions `100%`, lines `100%`
- `src/lib/http/client.ts`: statements `52.17%`, branches `43.26%`
- `src/pages/admin/ProfileSecurityPage/ProfileSecurityPage.tsx`: statements `70.17%`, branches `48.97%`
## Validation Notes
- Frontend full coverage now completes with `42` passing test files and `171` passing tests.
- The required sequential frontend validation path passed:
- `lint`
- `build`
- `test:coverage`
- 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 should continue to be tracked honestly.
## Real Conclusion
- `src/lib/http/csrf.ts` is no longer an open `Q-004` gap.
- `Q-004` still cannot be honestly declared closed.
- The remaining highest-value frontend gaps are now more concentrated in:
- `src/lib/http/client.ts`
- deeper remaining `ProfileSecurityPage` branches