user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-110341.md

2026-03-28 Q-004 Coverage Remediation Pass 15

Scope

• Continue strict Q-004 closure work after Pass 14.
• Close the remaining low-cost shell and safety-fallback hotspots in:
  • frontend/admin/src/app/App.tsx
  • frontend/admin/src/app/RootLayout.tsx
  • frontend/admin/src/components/common/ErrorBoundary/ErrorBoundary.tsx
• Re-verify closure through targeted shell tests plus full frontend validation.

Changes

Frontend

• Added shell and boundary coverage in:
  • frontend/admin/src/app/App.test.tsx
  • frontend/admin/src/app/RootLayout.test.tsx
  • frontend/admin/src/components/common/ErrorBoundary/ErrorBoundary.test.tsx
• Newly covered behavior includes:
  • app shell wiring between ErrorBoundary, Suspense, and RouterProvider
  • RootLayout wrapping the route outlet in AuthProvider
  • ErrorBoundary child passthrough, custom fallback rendering, default fallback rendering, and reset behavior
• Test hygiene hardening:
  • ErrorBoundary tests now suppress expected jsdom uncaught-error noise from deliberate throw cases so the targeted path stays clean

Backend

• No backend code changes were required in this pass.

Verified Commands

cd D:\project\frontend\admin
npm.cmd run test:run -- src/app/App.test.tsx src/app/RootLayout.test.tsx src/components/common/ErrorBoundary/ErrorBoundary.test.tsx
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage

Results

Frontend coverage

• Overall:
  • statements 89.72%
  • branches 77.57%
  • functions 84.48%
  • lines 90.64%
• Target areas:
  • src/app/App.tsx: statements 100%, branches 100%, functions 100%, lines 100%
  • src/app/RootLayout.tsx: statements 100%, branches 100%, functions 100%, lines 100%
  • src/components/common/ErrorBoundary/ErrorBoundary.tsx: statements 100%, branches 83.33%, functions 100%, lines 100%

Validation Notes

• Frontend full coverage now completes with 47 passing test files and 214 passing tests.
• The required sequential frontend validation path passed:
  • test:run -- src/app/App.test.tsx src/app/RootLayout.test.tsx src/components/common/ErrorBoundary/ErrorBoundary.test.tsx
  • 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/app/App.tsx is no longer an open Q-004 gap.
• src/app/RootLayout.tsx is no longer an open Q-004 gap.
• src/components/common/ErrorBoundary/ErrorBoundary.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/app/router.tsx
  • src/pages/admin/DashboardPage/DashboardPage.tsx
  • shared page-state coverage such as src/components/feedback/PageState/PageState.tsx
  • the post-summary jsdom AggregateError coverage-noise hygiene issue