Writing Custom Generators for Elixir Property-Based Testing

Standard unit tests often miss edge cases because we only test the scenarios we can anticipate. Property-based testing solves this by generating hundreds of random inputs to stress-test your code's invariants, but standard generators are rarely enough for complex, real-world business logic. This course teaches you how to construct tailored, highly specific data generators that mimic your actual production payloads. You will transition from writing basic, repetitive unit tests to crafting intelligent test suites that automatically discover critical edge cases and security vulnerabilities in your Elixir applications. What you'll learn: - Understand the core principles of property-based testing and invariant identification - Create custom generators for complex, nested data structures and domain-specific types - Apply filtering, mapping, and combining techniques to shape your generated test data - Control generator distribution to balance performance with deep edge-case coverage - Debug failing tests effectively by understanding shrinking behaviors and seed reproduction - Integrate modern Elixir testing practices to ensure your test suite remains maintainable You will start with foundational testing concepts and basic generator mechanics before moving step-by-step into advanced composition techniques, stateful testing concepts, and real-world Elixir integration patterns. Every concept is explained through clear, written theory and practical code examples. This course is designed for beginner to intermediate Elixir developers who want to elevate their testing methodology beyond basic unit tests. No prior experience with property-based testing is required. Start writing smarter, self-checking test suites that find bugs automatically.