Testing
AWS SQS and SNS Testing: LocalStack, Mocking, and End-to-End Async Flows
AWS SQS and SNS are everywhere in serverless and microservice architectures. They're also surprisingly easy to test badly.
SQS
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Testing
AWS Messaging Testing Best Practices: DLQ, Retry, Idempotency, and Message Ordering
The failure modes of SQS, SNS, and EventBridge are well-known: duplicate delivery, out-of-order messages, poison pills that fill DLQs, and missing idempotency guards that corrupt state. This post covers the testing patterns that catch these bugs before they reach production. Key Takeaways Test idempotency explicitly. SQS delivers
Testing
LocalStack Integration Testing: Full SQS + SNS + Lambda Stack Setup
moto is great for unit tests but stops at service boundaries. When you need SQS triggering Lambda, SNS fan-out to multiple SQS queues, or Lambda updating DynamoDB — you need LocalStack. This guide sets up a full LocalStack integration test environment with Docker Compose, pytest fixtures, and reusable infrastructure helpers.
Testing
AWS SQS Testing Guide: Unit and Integration Testing with LocalStack, moto, and boto3
Testing SQS consumers and producers without hitting real AWS is the only way to run fast, isolated tests. moto gives you an in-process mock for unit tests. LocalStack gives you a full local AWS stack for integration tests. This guide covers both, with patterns for FIFO queues, dead-letter