Unit Testing and Test-Driven Development in Python with PyTest

Writing software that works today is only half the battle; ensuring it remains reliable as it grows requires a disciplined approach to testing. This text-based course introduces you to the core principles of Unit Testing and Test-Driven Development (TDD) in Python, helping you build a robust safety net for your code. You will transition from writing untested scripts to designing highly maintainable, modular Python applications. By adopting a test-first mindset, you will write cleaner code, discover design flaws early, and gain the confidence to refactor your codebase without breaking existing functionality. What you'll learn: - Understand the foundational concepts of unit testing, the TDD lifecycle, and why they matter in modern software development. - Write clean and expressive unit tests using the modern PyTest framework, including fixtures and parameterized tests. - Apply TDD principles by writing tests before production code to guide your software design. - Isolate code under test using mock objects and test doubles with Python's built-in libraries. - Integrate modern Python practices like type hints to make your test suites more readable and self-documenting. - Implement testing best practices to avoid common pitfalls and maintain a fast, reliable test suite. The course begins with essential testing terminology and setup before guiding you through practical, written examples of writing tests, refactoring code, and mocking external dependencies. This course is designed for beginner Python developers who want to learn professional testing practices, with no prior testing experience required. Start reading today to master the discipline of test-driven development and write Python code you can trust.