Eliminating Flaky Tests with Traffic Replay

Flaky tests can undermine developer productivity and CI/CD reliability by producing inconsistent results caused by unstable third-party services, changing application state or data, timing variability, and non-deterministic inputs such as LLM responses. The proposed remedy is traffic capture and replay, which records real API and network interactions from development, staging, or production environments, analyzes or modifies the captured data, and replays it as stable test scenarios. By replacing live external dependencies and dynamic responses with repeatable traffic-based mocks, teams can conduct integration, load, security, UI, and automated tests under controlled conditions while reducing external API costs and false failures. Tools such as GoReplay and Speedscale are presented as ways to integrate this approach into continuous integration pipelines, support test automation, reproduce production-like behavior, and help teams isolate regressions and performance issues more reliably.

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