Test Automation Framework
Complete technical reference for designing, building, and operating a production-grade test automation framework.
Sections
1. Architecture
| File |
Topics |
| Goals & Principles |
Scalability, maintainability, stability goals; DRY, KISS, SOLID, test independence, determinism |
| Layers & Responsibilities |
Test / Abstraction / Core / Infrastructure / Data layers; responsibility matrix; dependency direction |
| Directory Structure |
Canonical project layout; tests/, framework/, data/, config/; AAA test structure; naming conventions |
2. Design Patterns
| File |
Topics |
| UI Patterns |
Page Object Model (POM); composition over inheritance; Screenplay pattern; Actor/Task/Interaction/Question |
| API & Data Patterns |
Request Builder; Response Validator; Test Data Builder; Fixture pattern; Factory pattern |
| Advanced Patterns |
Fluent Interface; Wrapper pattern; Custom assertion helpers; Template base class; Data-driven parametrize |
3. Test Data Management
| File |
Topics |
| Strategies & Isolation |
Static / dynamic / randomised data; unique IDs; transactional rollback; cleanup strategies; isolation guide |
| Builders, Factories & Seeding |
Full builder pattern with dataclass; nested builders; resource factory with cleanup; DB seeding |
4. API Testing
| File |
Topics |
| REST & GraphQL |
Domain clients; REST test checklist; JSON schema validation; GraphQL client; error testing; versioning tests |
| gRPC & WebSocket |
gRPC stub wrapper; proto contract validation; WebSocket async client; event-driven tests; lifecycle tests |
5. UI Testing
| File |
Topics |
| Tools & Patterns |
Playwright vs Selenium comparison; selector strategy (data-testid first); POM with Playwright; UI test checklist |
| Wait, Retry & Selectors |
Auto-wait vs explicit waits; network-aware waiting; retry decorator; selector abstraction layer; screenshot on failure |
6. Execution & Reliability
| File |
Topics |
| Parallel Execution |
pytest-xdist; thread safety; resource isolation; marks (unit/integration/api/e2e/smoke); selective runs |
| Flakiness |
Root causes; solutions by cause; frozen time; quarantine pattern; flakiness metrics; CI rerun detection |
| Mocking & Isolation |
Mock / Stub / Fake / Spy comparison; pytest-mock; respx HTTP mocking; over-mocking risks; Testcontainers |
7. Config, CI & Decisions
| File |
Topics |
| Config Management |
Pydantic env config; YAML per environment; secrets management; feature flags; startup validation |
| Logging & Reporting |
Structured logging; request/response logs; Allure; JUnit XML; screenshots; observability metrics |
| CI/CD Integration |
Pipeline stages; GitHub Actions example; quality gates; coverage threshold; pre-commit; nightly suite |
| Performance & Security |
Latency SLO assertions; Locust load tests; auth security tests; injection tests; rate limiting tests |
| Extensibility & Anti-Patterns |
Custom plugins; reporters; protocol interfaces; god POM; hardcoded data; coupling; over-mocking |
| Risks & Decisions |
Framework risks; microservices contract testing; frontend patterns; WebSocket testing; senior heuristics; maturity stages |
Quick Navigation by Topic
See also