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testing (4)

Playwright — End-to-end browser testing across Chromium, Firefox, WebKit

Cross-browser end-to-end test runner from Microsoft with auto-waiting, role-based selectors, trace viewer, and codegen.
javascript playwright testing browser e2e

Testing Strategies — Pyramid, Fixtures, Mocks, Property-Based, and CI Patterns

A practical guide to test design — the pyramid (unit/integration/e2e), fixture and mock patterns, property-based testing, snapshot tests, and CI strategies that scale.
testing unit-tests integration-tests e2e fixtures mocks property-based ci tdd

mypy — Static Type Checker

Catch type errors before runtime with mypy. Covers strict mode, common error codes, type: ignore annotations, gradual typing, and pyproject.toml configuration.
python mypy typing types static-analysis type-hints

pytest — Testing Framework

Write and run Python tests with pytest. Covers test discovery, assertions, fixtures, parametrize, conftest, and common patterns.
python pytest testing fixtures parametrize tdd