docs: create phase 2 frontend tests design specification

docs/superpowers/specs/2026-04-18-phase-2-frontend-tests-design.md

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+# Phase 2 Frontend Tests Design Specification
+
+**Date:** 2026-04-18  
+**Status:** APPROVED  
+**Target:** 80%+ coverage for frontend components, hooks, utilities  
+**Branch:** `refactor/ai-friendly`  
+**Reference:** Phase 1 Backend Tests (TDD pattern, subagent-driven execution)
+
+---
+
+## 1. Overview
+
+Phase 2 creates a comprehensive Vitest test suite for the aInventory frontend, mirroring the TDD approach and execution patterns from Phase 1 (backend tests). The goal is to establish 80%+ coverage across 9 test files: 4 component suites, 3 utility/hook suites, and 2 integration workflows.
+
+**Key Alignment with Phase 1:**
+- Test infrastructure first (setup.ts ≈ conftest.py)
+- Balanced unit + integration testing
+- Shared fixtures to avoid duplication
+- Subagent-driven execution (batches of 2-3 files)
+- Git tags for phase completion & rollback
+
+---
+
+## 2. Test Architecture & Setup
+
+### 2.1 File Structure
+
+```
+frontend/tests/
+├── setup.ts                           # Vitest config, shared mocks, fixtures
+├── components/
+│   ├── Scanner.test.tsx               # QR scan + OCR matching
+│   ├── AIOnboarding.test.tsx          # AI extraction wizard
+│   ├── AdminOverlay.test.tsx          # Admin config UI
+│   └── IdentityCheckOverlay.test.tsx  # Login form
+├── hooks/
+│   └── useAdmin.test.ts               # Admin state hook
+├── lib/
+│   ├── api.test.ts                    # Axios + retry logic
+│   └── labels.test.ts                 # SVG/QR generation
+└── integration/
+    ├── scanner-workflow.test.tsx      # Scan → match → adjust
+    └── inventory-workflow.test.tsx    # View → filter → create → sync
+```
+
+### 2.2 Setup.ts (Shared Fixtures & Mocks)
+
+**Purpose:** Centralized Vitest configuration and reusable mock fixtures (analogous to Phase 1's conftest.py)
+
+**Contents:**
+1. **Vitest globals** — enable `describe`, `it`, `expect` without imports
+2. **vi.mock() calls** for:
+   - `axios` — stub GET/POST/PUT with fixed responses
+   - `dexie` — in-memory IndexedDB replacement
+   - `html5-qrcode` — stub camera access (requestPermission, scan)
+   - `next/router` — stub Next.js routing
+3. **Shared fixtures:**
+   - Mock user token (valid + invalid variants)
+   - Mock item list response (5 items with various states)
+   - Mock AI extraction response (Gemini + Claude formats)
+   - Mock offline sync queue
+4. **Cleanup:** Reset mocks before each test
+
+**Philosophy:** 
+- Same fixtures reused across all 9 test files
+- Test-specific overrides allowed (e.g., `vi.spyOn(axios, 'post').mockReturnValue(...)`)
+- Reduces boilerplate, ensures consistency
+
+### 2.3 Vitest Configuration (vitest.config.ts)
+
+**Setup:**
+```typescript
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./tests/setup.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html'],
+      all: true,
+      lines: 80,
+      functions: 80,
+      branches: 80,
+      statements: 80,
+    },
+  },
+})
+```
+
+**Key Settings:**
+- `environment: 'jsdom'` — simulate browser for React components
+- `setupFiles` — load shared mocks before tests
+- Coverage thresholds: **80%+ across all metrics** (lines, functions, branches, statements)
+
+### 2.4 Package.json Updates
+
+**Add dependencies:**
+```json
+{
+  "devDependencies": {
+    "vitest": "^1.0.0",
+    "@vitest/ui": "^1.0.0",
+    "@testing-library/react": "^14.0.0",
+    "@testing-library/user-event": "^14.0.0",
+    "@testing-library/jest-dom": "^6.0.0",
+    "@vitejs/plugin-react": "^4.0.0",
+    "jsdom": "^23.0.0"
+  }
+}
+```
+
+**Test scripts:**
+```json
+{
+  "scripts": {
+    "test": "vitest",
+    "test:ui": "vitest --ui",
+    "test:coverage": "vitest run --coverage"
+  }
+}
+```
+
+---
+
+## 3. Component Tests (4 Files)
+
+### 3.1 Scanner.test.tsx
+
+**What it tests:**
+- Viewport rendering (video element, canvas overlay)
+- Zoom controls (1x → 2x → max cycle)
+- OCR matching engine (scoring, threshold logic)
+- Camera permission flows
+- State updates on scan result
+
+**Test Types:**
+- **Unit:** Zoom logic, matching score calculation, error handling
+- **Integration:** Real component tree, mocked camera, verify state callbacks
+
+**Coverage Targets:**
+- Render paths: initial + error states
+- Zoom cycle: all 4 states (1x, 2x, max/2, max)
+- Matching: exact match (500pts), partial (200pts), token (50pts), category (20pts), threshold (40pts)
+- Callbacks: onScanResult, onError
+
+**Key Mocks:**
+- `html5-qrcode` — stub camera access, return fixed QR/barcode string
+- Component props — onScanResult callback verification
+
+---
+
+### 3.2 AIOnboarding.test.tsx
+
+**What it tests:**
+- Step progression (image capture → extraction → confirmation)
+- Image preprocessing (validation, resize, crop, filter)
+- AI response formatting (Gemini vs Claude)
+- User validation of extracted data
+- Form submission
+
+**Test Types:**
+- **Unit:** Step validation, data transformation, error messages
+- **Integration:** Full wizard flow, mocked AI response, verify final submit
+
+**Coverage Targets:**
+- Step transitions: capture → extraction → confirm → done
+- Image validation: size, format, EXIF handling
+- AI response parsing: field mapping, confidence scores
+- User override: edited fields on confirmation step
+- Submit: API call with validated data
+
+**Key Mocks:**
+- `axios.post('/ai/extract')` — return mock Gemini/Claude response
+- Canvas API — image preprocessing simulation
+
+---
+
+### 3.3 AdminOverlay.test.tsx
+
+**What it tests:**
+- Tab rendering (Identity, Database, LDAP, AI, Categories)
+- Form field validation (required, format, length)
+- Form submission with mocked API
+- Error message display
+- Loading states
+
+**Test Types:**
+- **Unit:** Field validation, error rendering, tab switching
+- **Integration:** Full form submission, mock API response, state update
+
+**Coverage Targets:**
+- Tab rendering: all 5 tabs present and switchable
+- Form validation: required fields, format validation, error messages
+- Submission: API call with payload, success/error handling
+- Loading state: button disabled, spinner visible during submission
+
+**Key Mocks:**
+- `axios.put('/admin/config')` — mock successful + error responses
+- Form fields — controlled component rendering
+
+---
+
+### 3.4 IdentityCheckOverlay.test.tsx
+
+**What it tests:**
+- Login form rendering (username, password, login button)
+- Form validation (required fields)
+- LDAP authentication flow
+- Local password authentication fallback
+- Token storage and success callback
+
+**Test Types:**
+- **Unit:** Form validation, error handling
+- **Integration:** Login flow, mocked auth endpoint, token storage
+
+**Coverage Targets:**
+- Form fields: username + password required
+- Validation: empty field errors
+- LDAP login: POST to `/auth/login` with credentials
+- Success: token stored, onLoginSuccess callback fired
+- Error: error message displayed, form remains editable
+
+**Key Mocks:**
+- `axios.post('/auth/login')` — mock LDAP response with JWT token
+- localStorage — in-memory token storage
+
+---
+
+## 4. Hook & Utility Tests (3 Files)
+
+### 4.1 useAdmin.test.ts
+
+**What it tests:**
+- Hook initialization (load config from API)
+- State updates (identity, DB, LDAP, AI, categories)
+- Validation before submission
+- Error handling and retry logic
+
+**Test Types:**
+- **Unit:** State mutations, validation logic
+- **Integration:** API calls (mocked), state persistence
+
+**Coverage Targets:**
+- Initialization: load admin config on mount
+- State updates: each config section (identity, LDAP, AI, etc.)
+- Validation: required fields, format checks
+- Submission: API call with validated payload
+- Error states: network failure, validation error, server error
+
+**Key Mocks:**
+- `axios.get('/admin/config')` — return mock config object
+- `axios.put('/admin/config')` — mock success + error responses
+
+---
+
+### 4.2 api.test.ts
+
+**What it tests:**
+- Axios instance configuration (base URL, headers, auth)
+- Request construction (query params, body, headers)
+- Retry logic for network failures
+- Response parsing and error mapping
+- Token refresh on 401
+
+**Test Types:**
+- **Unit:** Request building, error mapping, retry logic
+- **Integration:** Mocked axios, verify request/response flow
+
+**Coverage Targets:**
+- Auth headers: JWT token in Authorization header
+- Request types: GET, POST, PUT, DELETE
+- Query params: proper URL encoding
+- Retry: exponential backoff on network error
+- Error mapping: HTTP status → human-readable error message
+- Token refresh: 401 triggers new login flow
+
+**Key Mocks:**
+- `axios` — intercept requests, mock responses
+
+---
+
+### 4.3 labels.test.ts
+
+**What it tests:**
+- SVG Code 128 barcode generation
+- SVG QR code generation (no external library)
+- Canvas-to-PNG rasterization (browser export)
+- Label dimension validation (62mm x 29mm)
+
+**Test Types:**
+- **Unit:** SVG encoding, QR structure validation
+- **Integration:** Canvas API, image export
+
+**Coverage Targets:**
+- Code 128 encoding: valid barcode structure
+- QR generation: valid QR format
+- SVG output: valid XML structure, correct dimensions
+- Canvas export: PNG blob generation
+- Error handling: invalid input, encoding errors
+
+**Key Mocks:**
+- Canvas API — stub createImageData, getContext
+
+---
+
+## 5. Integration Tests (2 Files)
+
+### 5.1 scanner-workflow.test.tsx
+
+**What it tests:**
+- End-to-end: Scan QR/barcode → OCR match → select item → stock adjustment
+- Real component tree: Scanner + ItemList + StockAdjustmentForm
+- Mocked: html5-qrcode, axios (item API, stock update API)
+
+**User Journey:**
+1. Scanner displays, user clicks "Scan"
+2. html5-qrcode stub returns barcode string
+3. Matching engine finds item (exact or partial match)
+4. Item details displayed in form
+5. User adjusts quantity, clicks "Check In"
+6. API updates stock, success message shown
+
+**Coverage Targets:**
+- Scan trigger → match → form population
+- User interaction: quantity adjustment, submission
+- API integration: stock update call
+- Error handling: no match found, network error
+
+**Key Mocks:**
+- `html5-qrcode` — return fixed barcode on scan
+- `axios.get('/items')` — return mock item list
+- `axios.post('/operations/checkin')` — mock success response
+
+---
+
+### 5.2 inventory-workflow.test.tsx
+
+**What it tests:**
+- End-to-end: View inventory → filter/sort → create new item → offline sync
+- Real component tree: Dashboard + ItemTable + CreateItemModal + SyncStatus
+- Mocked: axios (all API calls), Dexie (IndexedDB for offline queue)
+
+**User Journey:**
+1. Dashboard loads, displays item list from API
+2. User filters by category, sorts by quantity
+3. User clicks "Create Item", fills form, submits
+4. Network goes offline (axios fails)
+5. Item queued in IndexedDB (offline sync)
+6. Network comes back online
+7. Sync button triggers, offline items sent to backend
+8. Item list updates
+
+**Coverage Targets:**
+- Data loading: initial list from API
+- Filter/sort: UI updates, no API call
+- Create item: form submission, success message
+- Offline queue: Dexie stores pending items
+- Sync: batch API call for offline items, success/error handling
+
+**Key Mocks:**
+- `axios.get('/items')` — return mock inventory
+- `axios.post('/items')` — handle create + batch sync
+- `Dexie.table('pending_operations')` — in-memory queue
+
+---
+
+## 6. Execution Plan (Subagent-Driven)
+
+### 6.1 Batch 1: Scanner Foundation (Tests 1-2)
+
+**Files:** `setup.ts`, `Scanner.test.tsx`
+
+**Tasks:**
+1. Create `frontend/tests/setup.ts` with Vitest config, shared mocks (axios, html5-qrcode, Dexie, next/router)
+2. Create `frontend/tests/components/Scanner.test.tsx` with unit + integration tests
+3. Run `npm test -- --coverage` and verify 80%+ on Scanner module
+
+**Roles:**
+- Implementer: Write setup + Scanner tests
+- Reviewer 1: Validate mock fixtures align with Phase 1 patterns
+- Reviewer 2: Verify test coverage (render, zoom, matching, callbacks)
+
+**Success Criteria:**
+- setup.ts exports fixtures and vi.mock() setup
+- Scanner tests cover all paths (unit + integration)
+- `npm test -- --coverage` shows 80%+ on Scanner module
+- All tests passing, no console errors
+
+**Commit:** `test: setup vitest and create Scanner test suite`
+
+---
+
+### 6.2 Batch 2: AIOnboarding & Hooks (Tests 3-5)
+
+**Files:** `AIOnboarding.test.tsx`, `useAdmin.test.ts`, `api.test.ts`
+
+**Tasks:**
+1. Create `frontend/tests/components/AIOnboarding.test.tsx` — step progression, AI response parsing
+2. Create `frontend/tests/hooks/useAdmin.test.ts` — state management, form submission
+3. Create `frontend/tests/lib/api.test.ts` — request building, retry logic, error mapping
+
+**Roles:**
+- Implementer: Reuse Batch 1 fixtures, write 3 test files
+- Reviewer 1: Ensure consistent mock usage across files
+- Reviewer 2: Verify 80%+ coverage on all 3 modules
+
+**Success Criteria:**
+- All 3 test files created
+- Reuse setup.ts fixtures (no duplication)
+- `npm test -- --coverage` shows 80%+ on AIOnboarding, useAdmin, api
+- All tests passing
+
+**Commit:** `test: add AIOnboarding, useAdmin, api test suites`
+
+---
+
+### 6.3 Batch 3: Admin & Utilities (Tests 6-7)
+
+**Files:** `AdminOverlay.test.tsx`, `labels.test.ts`
+
+**Tasks:**
+1. Create `frontend/tests/components/AdminOverlay.test.tsx` — tab rendering, form validation, submission
+2. Create `frontend/tests/lib/labels.test.ts` — barcode/QR generation, canvas export
+
+**Roles:**
+- Implementer: Write 2 test files
+- Reviewer 1: Validate form field coverage (5 tabs, validation logic)
+- Reviewer 2: Verify SVG/canvas test patterns
+
+**Success Criteria:**
+- Both test files created
+- AdminOverlay covers all 5 tabs + form submission
+- labels.ts covers Code 128, QR, canvas export
+- `npm test -- --coverage` shows 80%+ on both modules
+
+**Commit:** `test: add AdminOverlay and labels test suites`
+
+---
+
+### 6.4 Batch 4: Identity & Integration (Tests 8-9)
+
+**Files:** `IdentityCheckOverlay.test.tsx`, `scanner-workflow.test.tsx`, `inventory-workflow.test.tsx`
+
+**Tasks:**
+1. Create `frontend/tests/components/IdentityCheckOverlay.test.tsx` — login form, LDAP flow, token storage
+2. Create `frontend/tests/integration/scanner-workflow.test.tsx` — scan → match → adjust
+3. Create `frontend/tests/integration/inventory-workflow.test.tsx` — view → filter → create → sync
+
+**Roles:**
+- Implementer: Write 3 test files
+- Reviewer 1: Validate login flow coverage (LDAP, error states)
+- Reviewer 2: Verify integration test patterns (real component tree, mocked API)
+
+**Success Criteria:**
+- All 3 test files created
+- IdentityCheckOverlay covers login + error states
+- scanner-workflow covers end-to-end scan flow
+- inventory-workflow covers CRUD + offline sync
+- `npm test -- --coverage` shows 80%+ on all modules
+
+**Commit:** `test: add IdentityCheckOverlay and integration test suites`
+
+---
+
+### 6.5 Phase Completion
+
+**Tasks:**
+1. Run full test suite: `npm test -- --coverage`
+2. Verify 80%+ coverage across all files
+3. Create git tag: `phase-2-complete`
+4. Update `SESSION_STATE.md` with Phase 2 status
+5. Update `REFACTORING_PROGRESS.md` (mark Phase 2 ✅)
+
+**Success Criteria:**
+- All 9 test files created and passing
+- Coverage report: 80%+ on all metrics (lines, functions, branches, statements)
+- No console errors or warnings
+- Git tag `phase-2-complete` created
+
+**Commit:** `docs: mark phase 2 complete - frontend test suite at 80%+ coverage`
+
+---
+
+## 7. Success Metrics
+
+| Metric | Target | Status |
+|--------|--------|--------|
+| Test files created | 9 | ⏳ |
+| Total test cases | 100+ | ⏳ |
+| Coverage (lines) | 80%+ | ⏳ |
+| Coverage (functions) | 80%+ | ⏳ |
+| Coverage (branches) | 80%+ | ⏳ |
+| All tests passing | Yes | ⏳ |
+| No console errors | Yes | ⏳ |
+| Git tag `phase-2-complete` | Yes | ⏳ |
+
+---
+
+## 8. Dependencies & Pre-requisites
+
+- Phase 1 (Backend Tests) ✅ COMPLETE
+- Vitest installed (v1.0.0+)
+- @testing-library/react installed
+- jsdom (React component testing environment)
+- Git tag `phase-1-complete` available for rollback
+
+---
+
+## 9. Rollback Plan
+
+If Phase 2 encounters critical issues:
+
+```bash
+# Rollback to Phase 1 completion
+git reset --hard phase-1-complete
+
+# Delete Phase 2 tags
+git tag -d phase-2-complete
+
+# Resume when ready
+git checkout refactor/ai-friendly
+```
+
+---
+
+## 10. Next Phase (Phase 3)
+
+After Phase 2 completion:
+- Create `docs/superpowers/plans/2026-04-18-phase-3-e2e-tests.md`
+- Add Playwright E2E tests for critical workflows (login, scan, create item, offline sync, admin settings)
+- Target: 5+ workflows automated, <30 min runtime