work-club-manager/.sisyphus/notepads/self-assign-shift-task-fix/learnings.md

# Learnings - Self-Assignment Bug Fix

## Conventions & Patterns

*(To be populated as work progresses)*

## Technical Decisions

*(To be populated as work progresses)*

## Traceability Strategy (Task 5)
- Every acceptance criterion (AC) must map to a specific evidence file path.
- QA scenarios are categorized into happy-path (successful operations) and failure-path (error handling/guards).
- Playwright is used for UI/integration evidence (screenshots).
- Vitest and Bash are used for unit/build/cli evidence (text/logs).
- A traceability map file acts as the single source of truth for verification coverage.

## Task 4: Branch Setup Verification

### Branch Configuration
- **Branch Name**: `feature/fix-self-assignment`
- **Worktree Location**: `/Users/mastermito/Dev/opencode-self-assign-fix`
- **Base Commit**: `785502f` (matches main tip - no divergence)
- **Working Tree Status**: Clean, ready for implementation

### Key Observations
1. **Worktree correctly isolated**: Separate git directory prevents accidental main branch commits
2. **Feature branch at main tip**: Branch created fresh from latest main (commit 785502f)
3. **Zero commits ahead**: Branch has no local commits yet - ready for new work
4. **Safety verification**: Main branch untouched and not checked out in worktree

### Verification Artifacts
- Evidence file: `.sisyphus/evidence/task-4-branch-created.txt`
- Evidence file: `.sisyphus/evidence/task-4-main-safety.txt`

### Next Steps (Task 5+)
- Ready for implementation on feature/fix-self-assignment branch
- Changes will be isolated and independently reviewable
- Main branch remains protected and clean

## Task 2: Frontend Test Command Validation

### Canonical Commands Confirmed
All three required commands are present in `frontend/package.json` and callable:

1. **Lint Command**: `bun run lint`
   - Definition: `eslint`
   - Tool: ESLint v9
   - Config: `eslint.config.mjs`
   - Status: ✓ Verified callable

2. **Test Command**: `bun run test`
   - Definition: `vitest run`
   - Tool: Vitest v4.0.18
   - Config: `vitest.config.ts`
   - Status: ✓ Verified callable

3. **Build Command**: `bun run build`
   - Definition: `next build`
   - Tool: Next.js 16.1.6
   - Output Format: standalone (Docker-ready)
   - Config: `next.config.ts`
   - Status: ✓ Verified callable

### Environment Variables for Build
The `build` command is **NOT blocked by environment variables**:
- `NEXT_PUBLIC_API_URL`: Optional (fallback: http://localhost:5001)
- `NEXTAUTH_URL`: Optional (authentication layer only)
- `NEXTAUTH_SECRET`: Optional (authentication layer only)
- Keycloak vars: Optional (provider configuration only)

Build will succeed without any env vars set.

### Key Findings
- All scripts section entries verified at lines 5-12
- No missing or misnamed commands
- Build uses `next build` (not a custom build script)
- Next.js standalone output format optimized for containerization
- Commands ready for green gate verification

### Evidence Files Generated
- `.sisyphus/evidence/task-2-frontend-script-map.txt` - Command definitions
- `.sisyphus/evidence/task-2-script-guard.txt` - Completeness & env var analysis


## Task 9: Test Implementation for Self-Assignment Feature

### Session Mock Pattern (next-auth)
- **Source Pattern**: `shift-detail.test.tsx` (lines 26-31)
- **Pattern Format**:
  ```typescript
  vi.mock('next-auth/react', () => ({
    useSession: vi.fn(() => ({
      data: { user: { id: 'user-123' } },
      status: 'authenticated',
    })),
  }));
  ```
- **Key Insight**: Session mock must be placed at TOP of test file, BEFORE imports of hooks/components that use it
- **Position**: Lines 15-23 in task-detail.test.tsx (after navigation mock, before task hooks mock)

### Test Dependency: Implementation Required First
- Tests initially failed because component didn't have "Assign to Me" button implementation
- **Root Cause**: T7 implementation notes indicated button should be in component, but wasn't present
- **Solution**: Added to component at execution time:
  1. Import `useSession` from 'next-auth/react'
  2. Call `useSession()` hook at component start
  3. Add button rendering when `!task.assigneeId && session.data?.user`
  4. Add click handler calling `updateTask` with `assigneeId: session.data.user.id`

### Test Coverage Added
**Test 1**: Button Visibility (task-detail.test.tsx:100-112)
- Mocks task with `assigneeId: null`
- Asserts "Assign to Me" button renders
- Status: ✓ PASSING

**Test 2**: Mutation Call (task-detail.test.tsx:114-137)
- Mocks task with `assigneeId: null`
- Spy on `useUpdateTask.mutate`
- Clicks "Assign to Me" button via `fireEvent.click`
- Asserts mutation called with correct payload: `{ id: task.id, data: { assigneeId: 'user-123' } }`
- Status: ✓ PASSING

### Testing Library Choice
- **Initial Error**: `@testing-library/user-event` not installed
- **Solution**: Used `fireEvent` instead (from `@testing-library/react`, already installed)
- **Why**: All existing tests use `fireEvent`, so consistent with codebase pattern

### Test File Structure
- Total tests: 5 (3 existing + 2 new)
- All existing transition tests remain intact ✓
- Session mock added without side effects to existing tests ✓
- New tests follow existing pattern: mock hook, render, assert ✓

### Evidence File
- `.sisyphus/evidence/task-9-test-visibility.txt` - Contains full test run output showing all 5/5 pass