Unit Testing in Rust is actually easy!

Learn how to write unit tests in Rust using a practical example and learn what the test attribute is, and how to structure your test modules efficiently. If you are interested in how easy Tuples are in Rust, feel free to check out this video here: https://youtu.be/l-oUIB0yq_8 📝 Description Master the fundamentals of testing your Rust code with confidence. In this practical tutorial, we explore how to implement and organize unit tests to verify your logic safely and efficiently. Using a simplified e-commerce caching scenario, we will break down how to test time-based expiration (TTL) logic to prevent stale data. By the end, you will know exactly how to structure your test modules, use common assertions, and ensure your programs work exactly as expected without bloating your production binaries. Here is what you will learn: • Understand the core purpose of unit tests and how verifying small units of code in isolation guarantees robust functionality. • Discover standard Rust testing conventions, including using the `#[cfg(test)]` attribute to ensure your test code never accidentally compiles into your final application. • Learn how to build an e-commerce caching mechanism using `HashMap` and track safe TTL expirations with Rust's monotonic `Instant` clock. • Master essential testing macros like `assert_eq!`, including how to inject custom error messages to quickly track down elusive test failures. • Apply practical techniques for testing different scenarios, from handling missing keys gracefully to simulating real-world time delays that verify stale data expiration. ⏳ Timestamps: 00:00 - Introduction 00:16 - What are Unit Tests? 00:48 - Use Case 06:14 - Implementing the Unit Tests 14:27 - Outro 👋 Hey there! If you are new to this channel: Hey 👋 my name is Flo and I am a professional software engineer with a passion for coding in Golang, TypeScript, JavaScript, and Rust. This channel is where I share that passion and dive into the exciting world of software engine