turash/concept/16_testing_strategy.md
Damir Mukimov 4a2fda96cd
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## 14. Testing Strategy
**Recommendation**: Comprehensive testing pyramid.
### Testing Layers
1. **Unit Tests** (70% coverage target):
- Business logic functions (100% coverage)
- Matching algorithms (95% coverage, focus on edge cases)
- Economic calculations (100% coverage, ±€0.01 accuracy)
- Data validation (100% coverage, all error paths)
2. **Integration Tests** (20% of test suite):
- API endpoints (200+ test cases, all CRUD operations)
- Database operations (Neo4j + PostgreSQL integration)
- Event processing (Watermill pubsub reliability)
- Service integrations (external APIs, IoT devices)
3. **E2E Tests** (10% of test suite):
- Critical user flows (match discovery → connection → implementation)
- Match discovery and connection flow (85% success rate target)
- Payment processing (Stripe integration, transaction success rate >99.5%)
- Cross-browser compatibility (Chrome, Firefox, Safari, Edge)
### Testing Tools
- **Backend**:
- Built-in `testing` package (Go 1.25 improvements)
- `github.com/stretchr/testify`: Assertions, suites, mocks
- `github.com/golang/mock` or `github.com/vektra/mockery/v2`: Mocking
- **API Testing**:
- `net/http/httptest`: Built-in HTTP testing
- `github.com/go-resty/resty/v2`: For integration tests
- **E2E**: Playwright or Cypress
- **Graph Database Testing**:
- Testcontainers: `github.com/testcontainers/testcontainers-go`
- Neo4j test container setup
- **Load Testing**:
- `k6` (Go-based, recommended)
- `github.com/tsenart/vegeta`: HTTP load testing library
- **Benchmarking**: Built-in `go test -bench`
### Test Data Strategy
- **Fixtures**: Realistic test data generators
- **Test Database**: Isolated test environment
- **Snapshots**: Graph database snapshots for integration tests
- **Mocking**: External APIs (government registries, payment providers)
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