How to Build a Full Testing Toolkit for AWS Serverless Applications

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Testing AWS serverless applications requires a layered approach covering unit, integration, and end-to-end tests, each targeting different scopes and using different tools. The AWS SAM CLI enables local testing of Lambda functions and APIs via Docker containers that replicate the Lambda runtime, though it does not mock AWS services like DynamoDB or S3. Developers can use the moto library to intercept boto3 calls for AWS service mocking, while unittest.mock handles external HTTP API simulation during unit testing. API Gateway stages — such as dev, staging, and prod — provide environment isolation, with each stage supporting its own variables, throttling limits, and logging configurations. Stage variables allow Lambda functions to point to different backends per environment without requiring code changes.

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