How to Build Automated Integration Tests for a Serverless AWS API

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A developer tutorial published on DEV Community outlines a two-part workflow for building and testing a serverless Hello World API using AWS SAM, Python 3.11, and API Gateway. The guide distinguishes between unit tests, which validate code logic in isolation, and integration tests, which verify how components such as API Gateway and Lambda function together end-to-end. The tutorial walks through three testing stages: local integration testing against a SAM-simulated environment, manual verification of the live AWS deployment via browser and curl, and automated integration tests against the real deployed stack. The author also shares challenges encountered during the process and explains why passing unit tests alone does not confirm that a deployed API works correctly. A hands-on challenge is included, asking readers to add a new endpoint and push it through all three test layers independently.

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