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When the user wants to plan, design, or implement an A/B test or experiment. Also use when the user mentions "A/B test," "split test," "experiment," "test this change," "variant copy," "multivariate test," "hypothesis," "conversion experiment," "statistical significance," or "test this." For tracking implementation, see analytics-tracking.

Implements chaos engineering practices including fault injection, game days, steady-state hypothesis testing, and resilience validation following Principles of Chaos.

Python testing with pytest: fixtures, parametrize, mocking with unittest.mock, hypothesis property-based testing, coverage with pytest-cov, and TDD methodology for Python applications.

pytest, fixtures, mocking, hypothesis

Hypothesis-driven debugging — no guessing, no jumping to fixes.