Test Code Changes with Claude Code Using Real Traffic

Claude Code can accelerate feature development but requires integration testing to establish whether changes work with real production behavior rather than merely compiling. The described workflow uses proxymock’s MCP integration to automatically locate, download, and organize recorded production request-response traffic for an outerspace-go microservice, then replay that traffic through a local mock server while testing both existing and newly added endpoints. In the example, the new `/api/launches-summary` endpoint successfully accessed the SpaceX API when no prior recording existed, while replay tests showed that existing endpoints had not regressed. The process also identified a pre-existing NASA API rate-limit failure caused by a `DEMO_KEY`, demonstrating that production-traffic replay can reveal operational issues unrelated to the new change. The approach is presented as a repeatable way to reduce manual test-environment setup, validate API integrations against actual traffic patterns, and test services that depend on third-party APIs, internal services, or payment processors before deployment.

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