Java Unit Testing with Spring Boot and Mockito

Writing reliable software requires robust testing, but testing complex Spring Boot applications can feel overwhelming. This course guides you step-by-step through the process of isolating components, mocking dependencies, and validating application behavior with confidence. You will transition from writing basic assertions to designing complete, maintainable test suites for real-world Java applications. Through written explanations and practical code walkthroughs, you will gain the skills to verify business logic without deploying full application servers. What you'll learn: Understand the core principles of unit testing and test-driven development in Java; Configure JUnit 5 and Mockito to mock dependencies and isolate components; Apply slice testing annotations to validate controllers and database layers independently; Write clean assertions using modern libraries for highly readable test code; Implement best practices for testing asynchronous code and handling application exceptions; Practice building robust test suites through structured written exercises and code examples. The course begins with foundational testing concepts and JUnit 5 basics before moving into Mockito configuration and Spring Boot integration. You will progress from simple unit tests to mock-driven controller and database layer validation. This course is designed for beginner to intermediate Java developers who want to build high-quality, bug-free applications. No prior testing experience is required, though a basic understanding of Java and Spring Boot is recommended. Start reading today to elevate your Java development skills and write code you can trust.