# 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