Distributed microservice architectures bring scalability and modularity, but they also introduce complexity—especially when it comes to testing service orchestration. Coordinating multiple services with asynchronous dependencies, retries, and failure scenarios often leads to fragile or incomplete test coverage.
XState, a JavaScript and TypeScript library for finite state machines and statecharts, offers a powerful solution for modeling and testing these workflows. By representing your microservices orchestration as a state machine, you gain a single source of truth for expected behavior—and a way to simulate and validate it systematically.