user-system/docs/evidence/ops/2026-03-28/quality/COVERAGE_REMEDIATION_20260328-125454.md

2026-03-28 Q-004 Coverage Remediation Pass 20

Scope

• Continue strict Q-004 closure work after Pass 19.
• Fully close the remaining high-risk storage hotspot in:
  • frontend/admin/src/lib/storage/token-storage.ts
• Re-verify closure through targeted storage tests and full frontend validation.

Changes

Frontend

• Added dedicated storage coverage in:
  • frontend/admin/src/lib/storage/token-storage.test.ts
• Newly covered behavior includes:
  • in-memory refresh token read/write
  • blank and undefined normalization to null
  • explicit token clearing
  • presence checks for the in-memory token
  • session presence cookie detection
  • the no-document fallback branch

Backend

• No backend code changes were required in this pass.

Verified Commands

cd D:\project\frontend\admin
npm.cmd run test:run -- src/lib/storage/token-storage.test.ts
npm.cmd run lint
npm.cmd run build
npm.cmd run test:coverage

Results

Frontend coverage

• Overall:
  • statements 92.32%
  • branches 79.63%
  • functions 89.70%
  • lines 92.49%
• Target area:
  • src/lib/storage/token-storage.ts: statements 100%, branches 100%, functions 100%, lines 100%

Validation outcomes

• Full frontend coverage run now completes with:
  • 50 passing test files
  • 229 passing tests
• The required sequential frontend validation path passed:
  • test:run -- src/lib/storage/token-storage.test.ts
  • lint
  • build
  • test:coverage

Validation Notes

• 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 cannot be hidden.

Real Conclusion

• src/lib/storage/token-storage.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/lib/errors/AppError.ts
  • src/pages/admin/ImportExportPage/ImportExportPage.tsx
  • src/pages/NotFoundPage/NotFoundPage.tsx
  • the post-summary jsdom AggregateError coverage-noise hygiene issue