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Hand-written tutorials, ordered as a recommended learning path.

1. 21 Cypress E2E Write reliable E2E tests with Cypress — selectors, assertions, network stubbing, custom commands, and CI integration. 4 min read →
2. 22 Integration vs Unit Understand the tradeoffs between unit tests and integration tests. Learn the testing pyramid, trophy, and practical strategies for effective test suites. 7 min read →
3. 23 Mocking Strategies Learn when and how to mock dependencies in unit tests. Covers stubs, spies, fakes, mock patterns, and how to avoid over-mocking. 7 min read →
4. 24 pytest Fixtures Master pytest fixtures for reusable test setup and teardown. Covers scopes, parameterization, factories, autouse, and fixture composition. 6 min read →
5. 25 React Testing Library Learn to test React components the right way with React Testing Library. Covers rendering, queries, user events, async testing, and best practices. 7 min read →
6. 26 Eval Frameworks A practical overview of evaluation frameworks for AI applications: what they measure, how they differ, and how to pick one that matches your workflow. 4 min read →
7. 27 PBT Stop writing one example per test. Property-based testing generates inputs for you and finds the edge cases you would never think to write. 5 min read →
8. 28 Contract Tests Understand consumer-driven contract testing, how it differs from integration tests, and how tools like Pact prevent breaking API changes between services. 4 min read →
9. 29 Coverage Pitfalls Line, branch, and mutation coverage explained. Learn what each metric tells you, what it hides, and how to use coverage without gaming it. 4 min read →
10. 30 Playwright E2E Learn how to write reliable end-to-end tests with Playwright, including selectors, fixtures, auto-waiting, and patterns that avoid flakiness. 4 min read →
11. 31 Flaky Tests Diagnose and eliminate flaky tests caused by timing, ordering, shared state, and the network. Build a culture that stops flakes at the source. 4 min read →
12. 32 Load Testing with k6 A practical introduction to k6 for load testing HTTP services. Covers scripting, stages, thresholds, and how to read the results without fooling yourself. 4 min read →
13. 33 Mocks vs Stubs Pick the right test double for the job. Compare mocks, stubs, fakes, and spies, and learn when to skip them entirely. 4 min read →
14. 34 Test Pyramid What the testing pyramid actually means in modern apps, when to deviate, and how to keep each layer giving you the value it is supposed to. 5 min read →
15. 35 Snapshot Tests Learn how snapshot tests work, when they shine, and how to keep them maintainable instead of letting them rot into noise. 3 min read →
16. 36 Data Builders Stop drowning in fixture noise. Learn the Test Data Builder pattern to create clear, intention-revealing test data that survives schema changes. 4 min read →
17. 37 Vitest Tutorial A practical guide to Vitest, the testing framework built for modern JavaScript projects. Setup, syntax, mocking, coverage, and how it differs from Jest in ways that matter. 4 min read →
18. 38 Integration Tests A practical look at integration testing alongside unit tests, covering fixtures, real databases in tests, and the right balance with examples in pytest and vitest. 6 min read →