Spring Boot Unit Testing Tutorial for Beginners | JUnit + Mockito + Code Coverage
🚀 Spring Boot Unit Testing Tutorial for Beginners | JUnit + Mockito + Code Coverage
Unit testing is not just about writing extra code — it’s about protecting your system, preventing breakages, and building reliable software that lasts. In this session, we will break down everything a fresher or beginner developer needs to know about Unit Testing, Mocking, and Code Coverage in Spring Boot.
✅ What You’ll Learn in This Session:
Why unit testing is critical for project stability (even when original developers leave).
How unit testing prevents breaking old features when adding new code.
The role of JUnit and Mockito in writing effective unit tests.
The Arrange – Act – Assert pattern for structuring test methods.
How to use when().then() to override mock behavior.
Why robust assertions are key to catching hidden bugs.
Understanding mocking to isolate classes during testing.
The difference between unit testing and integration testing in Spring Boot.
Best practices for test classes, test methods, and project structure (src/test/java).
What is code coverage and why managers often demand 80%+ coverage.
How AI tools like ChatGPT can accelerate test generation and boost coverage.
An introduction to Test-Driven Development (TDD).
💡 Key Takeaways:
Unit testing is mandatory in real-world projects — not optional.
AI can speed up unit test writing by 10x, but developers must still understand the logic.
Code coverage ensures confidence in deployments and protects against regressions.
With proper unit tests, your system becomes team-driven, not person-dependent.
⚡ Who is this for?
Java/Spring Boot freshers preparing for interviews.
Developers who want to master JUnit & Mockito.
Anyone curious about AI-powered unit testing and modern testing practices.
📌 Don’t miss out! This session blends theory, practical demos, and AI-powered testing techniques to give you everything you need to get started with professional-grade testing in Spring Boot.
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