Advanced Testing Practices
Drive design with tests, isolate external boundaries with test doubles, and make coverage and CI tell the truth about what is verified.
Basic pytest experience and function knowledge.
Practice test-driven development (TDD), use mocking to isolate units, measure test coverage, and configure CI/CD pipelines for automated testing.
Read in order, or jump to what you need.
Every lesson builds on the one before it. Open any lesson to read the explanation, run the examples, and try the practice challenges.
- 11.01Test-Driven Development4 min
Use the red-green-refactor cycle to design interfaces from behavior and keep refactoring safe.
- 11.02Mocking and Patching4 min
Replace external boundaries with test doubles, verify interactions, and avoid mocks that hide real integration failures.
- 11.03Test Coverage and CI4 min
Measure what the suite executes, set meaningful thresholds, and run the same checks automatically on every change.
- 11.04Project: A Tested Payment ServiceProject4 min
Drive a payment service with a failing test, isolate the gateway behind a Protocol, make retries idempotent, and enforce coverage in CI.
Ready to move on?
Write a failing test first, implement the feature to pass it, add mocks for external dependencies, and verify 80%+ test coverage.
Open the module self-check