Lambda

AWS

AWS SAM Local Testing: Unit, Integration, and End-to-End

AWS SAM (Serverless Application Model) gives you infrastructure-as-code for serverless applications, but testing SAM applications before deployment has historically been painful. The sam local toolchain has matured significantly — this guide covers how to use it effectively for unit tests, local integration tests, and pre-deploy validation. Why SAM

AWS

Testing AWS Lambda Functions: Unit, Integration, and End-to-End Patterns

Testing Lambda functions is different from testing traditional services. Your function has no persistent process, it runs in an ephemeral container, and it's tightly coupled to AWS events and services. A function that works locally can fail in production due to IAM permissions, environment variable differences, timeout constraints,