Mocking Dependencies for Local Development
Blog post from Postman
A walkthrough demonstrates how Claude Code, using Postman plugin skills and the Context Graph, can prepare a gateway service for local development by discovering all external dependencies, creating Git-backed Postman Local Mock Servers, updating environment variables to route integrations to localhost, and testing both normal and failure scenarios. The gateway initially depended on services including Nylas, DocuSign, PayPal, Notion, and Pergomalum, with each mock stored in the repository and configured to run on a consistent local port. Context Graph analysis identified two additional cross-repository dependencies, calendar-sync-service and demographic-service, that conventional searches in the gateway repository would not have found, expanding coverage from five to seven mock integrations. The resulting configuration was committed through pull requests across affected repositories, enabling other developers to reproduce the setup, while emphasizing that local mocks improve development speed but do not replace testing against real services before release.
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