Property-Based Testing with Elixir and ExUnit

Traditional unit tests only check the scenarios you can think of, leaving hidden edge cases to fail in production. Property-based testing changes this by automatically generating hundreds of diverse test cases to stress-test your code's core properties and invariants. This text-based course guides you from the fundamental concepts of property-based testing to writing robust, self-testing Elixir applications. You will transition from writing manual, hardcoded test cases to defining high-level rules that your software must always obey. Through clear, written explanations and practical code examples, you will learn how to leverage Elixir's ecosystem to find bugs before your users do. What you'll learn: - Understand the core principles of property-based testing versus traditional unit testing - Define robust properties and invariants for your Elixir functions - Configure ExUnit to run property-based tests using modern integration tools - Generate complex, custom data types to simulate realistic application state - Analyze and debug failing tests using shrinking to find the minimal failing input - Apply property-based testing to real-world scenarios like stateful systems and APIs The course begins with foundational testing concepts, defining what properties are and how generators work, before moving into step-by-step implementation patterns and advanced data generation techniques. This course is designed for beginner to intermediate Elixir developers who want to improve their testing workflows. No prior experience with property-based testing is required, though a basic understanding of Elixir syntax and ExUnit is helpful. Start reading today to build bulletproof Elixir applications that stand up to any input.