Java Test-Driven Development: Practical TDD with JUnit and Mockito

Writing reliable software requires more than just coding; it demands a structured approach to testing that prevents bugs before they happen. Test-Driven Development (TDD) shifts your workflow from reactive debugging to proactive design, ensuring your Java applications are robust and maintainable. In this text-based course, you will transition from writing tests as an afterthought to using tests as a design tool. You will master the Red-Green-Refactor cycle, learn how to isolate dependencies using Mockito, and gain the skills needed to safely introduce tests into untested legacy Java codebases. What you'll learn: - Understand the foundational principles of the Red-Green-Refactor cycle and TDD philosophy. - Write clean and expressive unit tests using modern JUnit features and advanced assertion techniques. - Isolate code under test by creating mock objects, stubs, and verification behaviors with Mockito. - Apply TDD strategies to design modular, loosely coupled Java classes and modern data structures. - Refactor legacy Java code safely by establishing a reliable test harness before making changes. - Implement testing best practices to avoid common pitfalls like brittle tests and over-mocking. The course begins with core testing concepts and terminology before guiding you through step-by-step written explanations and practical Java code examples. You will progress from simple unit tests to mocking complex dependencies and refactoring real-world legacy scenarios. This course is designed for Java developers who want to adopt TDD practices. A basic understanding of Java syntax is recommended, but no prior testing experience is required. Start writing cleaner, more reliable Java code by adopting a test-first mindset today.