AWS Step Functions is a powerful orchestration service that allows modeling complex business workflows. It provides a visualization tool and can integrate with various AWS services, including Lambda, DynamoDB, and API Gateway. However, testing Step Functions can be challenging due to its complexity and the need to cover multiple failure modes. To address this, developers use two types of tests: sociable tests that target individual Lambda functions and end-to-end tests that execute the state machine for real. These tests help catch bugs in Lambda functions, IAM permission issues, and other problems. Additionally, using tools like Lumigo provides valuable insights into application performance and troubleshooting, making it easier to identify and fix issues.