# 2026-03-28 Q-004 Coverage Remediation Pass 9

## Scope

- Continue strict `Q-004` closure work after Pass 8.
- Fully close the remaining `LoginPage` frontend page cluster before moving to the next task.
- Re-verify closure through targeted tests plus full frontend validation.

## Changes

### Frontend

- Expanded login-page behavior coverage in:
  - `frontend/admin/src/pages/auth/LoginPage/LoginPage.test.tsx`
- Newly covered behavior includes:
  - fallback to default auth capabilities when capability loading fails
  - password login success and failure
  - safe redirect usage from router state and sanitized fallback from unsafe redirect queries
  - email-code send success and validation-error swallow path
  - email-code login success and failure
  - sms-code send success and failure
  - sms-code login success and failure
  - OAuth provider rendering, disabled-provider filtering, startup success, and startup failure

### Backend

- No backend code changes were required in this pass.

## Verified Commands

```powershell
cd D:\project\frontend\admin
npm.cmd run test:run -- src/pages/auth/LoginPage/LoginPage.test.tsx
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage
```

## Results

### Frontend coverage

- Overall:
  - statements `78.38%`
  - branches `64.77%`
  - functions `76.92%`
  - lines `79.19%`
- Target areas:
  - `src/pages/auth/LoginPage/LoginPage.tsx`: statements `92.56%`, branches `84.09%`, functions `86.2%`, lines `95.61%`
  - `src/pages/auth/RegisterPage/RegisterPage.tsx`: statements `77.63%`, branches `60.65%`
  - `src/pages/admin/ProfileSecurityPage/ProfileSecurityPage.tsx`: statements `70.17%`, branches `48.97%`
  - `src/lib/http/client.ts`: statements `52.17%`, branches `43.26%`
  - `src/lib/http/csrf.ts`: statements `25.71%`, branches `19.23%`

## Validation Notes

- Frontend full coverage now completes with `41` passing test files and `155` passing tests.
- 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.
- One attempt to run `npm.cmd run lint` and `npm.cmd run build` concurrently produced a transient Windows/Vite `index.html` emit-path failure.
  - The required standalone `npm.cmd run build` rerun passed immediately afterward.
  - This pass does not have enough evidence to classify that transient as a deterministic project defect.

## Real Conclusion

- `LoginPage` 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:
  - `RegisterPage`
  - deeper remaining `ProfileSecurityPage` branches
  - `lib/http`