Stateful Property Testing in Elixir: The Bookstore Project

Testing complex, stateful applications can feel like chasing a moving target when relying solely on traditional unit tests. By learning how to model system states and auto-generate test scenarios, you can uncover hidden edge cases in your Elixir applications before they reach production. This course guides you through the entire journey of implementing stateful property testing using PropEr in a realistic bookstore application context. You will learn to define robust state models, align them with a PostgreSQL database, and write custom generators that simulate real-world user behaviors. What you will learn: Understand the core principles of stateful property testing and how it differs from stateless testing; Configure PropEr within an Elixir and PostgreSQL environment; Build custom data generators to simulate complex, realistic application inputs; Define state machine models that accurately mirror database state transitions; Debug and interpret test failures using shrinking techniques to isolate root causes; Refine your test models to handle concurrency and complex business logic. The course begins with foundational concepts of property-based testing and state machine theory before guiding you through step-by-step implementation, model refinement, and advanced debugging workflows. This course is designed for Elixir developers who understand basic language syntax and want to elevate their testing strategies to a professional level. Start reading today to build resilient, self-testing Elixir applications.