user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-143209.md

2026-03-28 Q-004 Coverage Remediation Pass 23

Scope

• Continue strict Q-004 closure work after Pass 22.
• Fully close the remaining standalone 404 page hotspot in:
  • frontend/admin/src/pages/NotFoundPage/NotFoundPage.tsx
• Re-verify closure through targeted page tests and full frontend validation.

Changes

Frontend

• Added dedicated 404-page coverage in:
  • frontend/admin/src/pages/NotFoundPage/NotFoundPage.test.tsx
• Newly covered behavior includes:
  • 404 status rendering
  • missing-page subtitle rendering
  • primary recovery action rendering
  • navigation back to /dashboard

Backend

• No backend code changes were required in this pass.

Verified Commands

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

Results

Frontend coverage

• Overall:
  • statements 93.69%
  • branches 81.95%
  • functions 91.24%
  • lines 93.85%
• Target area:
  • src/pages/NotFoundPage/NotFoundPage.tsx: statements 100%, branches 100%, functions 100%, lines 100%

Validation outcomes

• Targeted page validation passed:
  • 1 passing test file
  • 1 passing test
• Full frontend coverage run now completes with:
  • 52 passing test files
  • 243 passing tests
• The required sequential frontend validation path passed:
  • test:run -- src/pages/NotFoundPage/NotFoundPage.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/pages/NotFoundPage/NotFoundPage.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/lib/hooks/useBreadcrumbs.ts
  • src/app/providers/ThemeProvider.tsx
  • the post-summary jsdom AggregateError coverage-noise hygiene issue