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.
SNS
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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 SNS Testing Strategies: Topics, Fan-Out Patterns, and DLQ Handling
SNS is a pub/sub service where one publisher sends to a topic and multiple subscribers receive. Testing SNS means verifying: messages reach the right subscribers, message filters work correctly, delivery failures go to the DLQ, and fan-out to SQS queues behaves as expected. moto handles all of this