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specs/019-superset-ux-redesign/tests/reports/2026-02-21-report.md

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+# Test Report: 019-superset-ux-redesign
+
+**Date**: 2026-02-21  
+**Executed by**: Tester Agent
+
+## Coverage Summary
+
+| Module | Tests | Coverage % |
+|--------|-------|------------|
+| Breadcrumbs.svelte | 5 | N/A (behavioral/contract tests) |
+| Frontend test suite total | 82 | N/A (coverage runner not executed) |
+
+## Test Results
+
+- Total: 82
+- Passed: 82
+- Failed: 0
+- Skipped: 0
+
+Executed command:
+```bash
+cd frontend && npm run test
+```
+
+## Issues Found
+
+| Test | Error | Resolution |
+|------|-------|------------|
+| `src/lib/stores/__tests__/sidebar.test.js` | Flaky state leakage (`isExpanded` assertion failed) | Added deterministic `beforeEach` reset for `sidebarStore` |
+| `src/lib/components/layout/__tests__/test_breadcrumbs.svelte.js` (initial approach) | Svelte render mode/runtime incompatibility in current test setup | Reworked into contract/logic-focused unit tests without client mount |
+
+## Changes Made
+
+- Added new co-located test file:
+  - `frontend/src/lib/components/layout/__tests__/test_breadcrumbs.svelte.js`
+- Stabilized existing test file:
+  - `frontend/src/lib/stores/__tests__/sidebar.test.js`
+- Added coverage matrix document:
+  - `specs/019-superset-ux-redesign/tests/coverage.md`
+
+## Next Steps
+
+- [x] Fix failed tests
+- [x] Add more coverage for layout module (`Breadcrumbs.svelte`)
+- [ ] Run backend test suite and address pre-existing backend import/auth issues separately
+- [ ] Optionally add frontend `vitest --coverage` run and publish numeric coverage report