Learn how to effectively test OTP processes and features in Elixir through this 36-minute conference talk from ElixirConf EU 2024. Discover practical insights from a real-world case study involving a large German energy company's system for monitoring and preventing energy flow problems in renewable networks. Explore techniques for testing complex infrastructure built with Supervision Trees and Processes within a monorepo environment. Master the challenges of testing Process-related components, including polling servers, in-memory repos, and proper mocking approaches. Gain valuable solutions for common testing puzzles encountered when working with OTP features in Elixir, particularly focused on addressing the complexities that arise when testing process-based architectures.