user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-144036.md

2026-03-28 Q-004 Coverage Remediation Pass 24

Scope

• Continue strict Q-004 closure work after Pass 23.
• Fully close the breadcrumb-hook hotspot in:
  • frontend/admin/src/lib/hooks/useBreadcrumbs.ts
• Re-verify closure through targeted hook tests and full frontend validation.

Changes

Frontend

• Refined the hook implementation in:
  • frontend/admin/src/lib/hooks/useBreadcrumbs.ts
• Removed redundant parent-injection logic that was dead under the current route model and added closure-grade tests in:
  • frontend/admin/src/lib/hooks/useBreadcrumbs.test.tsx
• Newly verified behavior includes:
  • root-path empty breadcrumb output
  • single-segment terminal breadcrumb output
  • nested breadcrumb output for known child routes
  • skipping unknown route segments while retaining known ancestors

Backend

• No backend code changes were required in this pass.

Verified Commands

cd D:\project\frontend\admin
npm.cmd run test:run -- src/lib/hooks/useBreadcrumbs.test.tsx
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage

Results

Frontend coverage

• Overall:
  • statements 93.84%
  • branches 82.29%
  • functions 91.21%
  • lines 94.01%
• Target area:
  • src/lib/hooks/useBreadcrumbs.ts: statements 100%, branches 100%, functions 100%, lines 100%

Validation outcomes

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