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New suites assert real behavior, not just that code runs: - test_types: workout serialization round-trips (recursive steps, camelCase keys, enum conversion) + __str__ formatting. - test_api_client: request construction (URL/method/auth/body) and the full HTTP status-code -> message mapping. - test_auth: RS256 JWT verification — valid -> AccessToken; expired/wrong-aud/ wrong-issuer/wrong-key/missing-claim -> None; audience slash variants. - test_server_setup: transport selection + start_server dispatch. - test_events / test_activities / test_custom_items: request payloads (create vs update, POST/PUT/DELETE), delete accounting, JSON-content parsing, and error/empty branches. Enforce >=90 via pytest --cov-fail-under=90; CI test job now gates the build. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>