Phase 5: Integration Tests - End-to-End Workflows

**Part of:** #170
**Depends on:** #171, #172, #173

## 📋 Phase 5: Integration Tests (Lower Priority)

### Scope
This phase focuses on end-to-end workflows and external service integration testing.

### 6. **End-to-End Workflows**
**Why later**: Complex setup, but validates complete user journeys.

#### Critical User Flows
- [ ] Complete word submission flow
- [ ] Word editing workflow
- [ ] Authentication flow
- [ ] Search and browse functionality

#### External Service Integration
- [ ] GitHub API integration
- [ ] OAuth flow with GitHub
- [ ] Repository operations

## Testing Strategy

### End-to-End Test Cases
- [ ] **New User Journey**
- Sign up/login via GitHub
- Submit first word
- Verify PR creation

- [ ] **Word Management Journey**
- Search for existing word
- Edit word content
- Verify PR update

- [ ] **Error Handling Journey**
- Network failures
- Authentication errors
- GitHub API rate limits

## 🎯 Success Criteria
- Complete user journeys validated
- External integrations working
- Error scenarios properly handled
- Performance benchmarks met

## 📅 Timeline
**Week 4** of testing implementation (Part 2)

## 🛠️ Setup Required
- Set up E2E testing framework (Playwright/Cypress)
- Configure test environment
- Set up GitHub test repository
- Create E2E test fixtures

## 🚨 Important Notes
- These tests will interact with external services
- Requires careful setup to avoid affecting production
- May need dedicated test GitHub repositories

まず依存する issue #171、#172、#173 を確認し、次に Playwright または Cypress のいずれかから E2E フレームワークを選択して、安全なテスト環境と GitHub テストリポジトリを用いて設定します。記載されたユーザージャーニー、GitHub API と OAuth のフロー、リポジトリ操作、エラーシナリオを網羅します。ワークフローと明記された成功基準が、本番環境に影響を与えずに検証されれば完了です。

索引モデルが issue の本文から書いたものです。