Run .NET Lambda Function Locally Using LocalStack
AWS Toolkit for Visual Studio makes it easier for developers to develop and debug Lambda functions locally but for actual Lambda integration test, we need to deploy Lambda function in AWS account.
Amazon SQS local development using LocalStack
Amazon SQS is a reliable, highly-scalable hosted queue for storing messages as they travel between applications or microservices. Amazon SQS moves data between distributed application components and helps you decouple these components. That means to test your application you will need to connect to the Amazon SQS service each time. For development and testing purposes, you’ll likely want to test locally.
Amazon S3 local development using LocalStack
It's always a good practice, before moving your code into cloud, do integration test from local dev environment. Let's say if you don't have AWS account access from your development machine Or you don't want to create resources in AWS account just for integration testing purpose in that situation LocalStack is best choice.