Modeling Circuit Breakers with Shim Modules in State Machine Testing

When building resilient distributed systems, testing how your software handles failure is just as critical as testing the happy path. This course introduces you to property-based testing in Erlang, focusing on how to model the classic circuit breaker pattern to ensure your applications fail gracefully and recover reliably. You will learn how to bridge the gap between abstract test properties and real-world implementation details using modular design patterns. By working through this structured text-only curriculum, you will transition from writing basic unit tests to designing comprehensive state machine models. You will gain a deep conceptual understanding of how to isolate external dependencies and simulate complex failure modes systematically. What you'll learn: - Understand the core principles of the circuit breaker pattern and state machine testing - Configure shim modules to decouple test models from live external dependencies - Write state machine properties in Erlang to verify system behavior under load - Simulate failures, timeouts, and recovery phases within your test suite - Analyze test failures and shrink test cases to find the root cause of bugs This course begins with foundational concepts, establishing a clear understanding of state machine testing and circuit breaker mechanics. Next, you will explore the design and integration of shim modules, learning how to structure your test code for maximum maintainability. Finally, you will practice writing and executing property-based tests that simulate realistic network instability and service degradation. This course is designed for backend developers, QA engineers, and systems architects who are familiar with Erlang basics and want to master advanced property-based testing techniques. No prior experience with state machine modeling or shim modules is required. Start reading today to build more resilient Erlang systems through systematic state machine testing.