In this course, you will begin by setting up your development environment for Java unit testing, covering all major platforms—Windows, macOS, and Linux. The course then introduces the fundamentals of Test-Driven Development (TDD), emphasizing the Red-Green-Refactor cycle to develop reliable applications. As the course progresses, you will dive into Mockito, learning how to mock dependencies and isolate components for efficient unit testing. Techniques such as creating mocks with mock(), using the @InjectMocks annotation for dependency injection, and employing spies for partial mocks will be covered in detail. The course concludes with advanced concepts like using argument matchers for flexible assertions and verifying mock behavior, ensuring that your tests remain accurate and comprehensive. By the end, you'll have a complete understanding of how to apply TDD and Mockito to your Java development projects, enabling you to write clean, maintainable, and fully tested code. You'll be ready to apply these techniques to real-world scenarios, enhancing your testing skills for professional development environments.