api-chaos-runner

Overview

Most API tests run against perfect networks: <1ms latency, no packet loss, infinite bandwidth, deterministic ordering. Real production isn't like that. Network chaos testing drives the existing tests under controlled network impairment - the team discovers which retry / circuit-breaker / timeout patterns actually hold up before real customers find out.

The canonical open-source primitive is Toxiproxy - Shopify's "TCP proxy to simulate network and system conditions for chaos and resiliency testing" (toxiproxy-readme). The pattern: sit Toxiproxy between client and upstream; manipulate toxics (latency, timeout, bandwidth, etc.) during test execution.