Java Unit Testing with Mockito: Practical Mocking Techniques

Writing reliable Java applications requires more than just functional code; it requires robust tests that isolate logic from external dependencies. This course introduces you to Mockito, the industry standard for creating mock objects and verifying behavior in Java unit tests. You will progress from understanding basic testing concepts to implementing professional mocking strategies that make your test suites faster and more maintainable. By the end of this course, you will be able to replace complex dependencies with controlled mock objects to test your code in isolation. What you'll learn: - Understand the fundamental principles of mocking and its role in the unit testing lifecycle - Configure Mockito within modern Java environments and integrate it with JUnit 5 - Apply annotations such as @Mock, @Spy, and @InjectMocks to streamline your test setup - Stub method calls to define specific behaviors for dependencies during test execution - Verify interactions to ensure your code communicates correctly with other components - Practice advanced techniques including argument matchers and testing modern Java features like records The course begins with essential terminology and the core philosophy of unit testing before moving into practical written exercises and code analysis. You will explore common scenarios, learning to handle complex dependencies and follow industry standards for clean, readable test code. This course is designed for beginner Java developers who want to improve their testing skills; no prior experience with mocking frameworks is required. Start reading today to build more reliable and professional Java applications.