Guides

setTimeout gives every call the same delay. Real dependencies don't — and that difference hides real bugs.

Use errorRate to reliably trigger failures and verify your retry and backoff behaviour.

Verify your timeout fires at the right threshold — not just when mocks respond instantly.

Simulate slow, error-prone dependencies to trip circuit breakers and test all three states.

LLM calls are 600ms–8s with high variance. Test timeouts, streaming UX, and rate-limit retries without burning tokens.

Add realistic latency to your CI pipeline to catch timeout and retry bugs before they reach production.