8.1 JUnit Tutorial for Java Developers | Unit Testing Explained | @Test, Assertions & Mockito Basics

🚀 Unit testing is a non-negotiable skill for professional Java developers. In this video, you'll learn what unit testing is, why it matters, how to write JUnit tests with @Test annotations, and how to use assertions to validate your code — all with live demos in IntelliJ. ⏱️ TIMESTAMPS 00:00 – What is Unit Testing? 00:14 – Why Test Individual Components? 00:58 – Unit Testing vs Integration Testing 01:30 – Adding JUnit Dependency in Maven (spring-boot-starter-test) 02:00 – JUnit Jupiter & Mockito in Classpath 03:00 – Writing Your First @Test Method 03:30 – Test Naming Conventions 04:00 – Testing a Calculator Class 05:00 – JUnit Assertions (assertEquals, assertTrue, etc.) 06:00 – @BeforeEach, @AfterEach Explained 07:00 – Mockito: Mocking Dependencies 09:00 – Running Tests in IntelliJ 11:00 – Test Reports & Pass/Fail Analysis 13:00 – Summary 📌 What You'll Learn: ✔ What unit testing is and why every Java developer needs it ✔ How to add JUnit dependency via spring-boot-starter-test ✔ How to write JUnit 5 tests with @Test and assertions ✔ How to use @BeforeEach and @AfterEach lifecycle methods ✔ Introduction to Mockito for mocking dependencies 🔥 Part of the Complete Java & Spring Boot Course for interview preparation. 📞 Book a 1:1 session: https://topmate.io/sps_tech 🌐 Website: https://sps-tech.in #JUnit #UnitTesting #JavaTesting #Mockito #SpringBootTest #JavaTutorial #JUnit5 #JavaDeveloper #JavaInterview #TestDriven I created this channel to increase knowledge awareness about Java-related topics and explain those topics that every Java developer finds challenging to learn or get started with. Book a call with me:- https://topmate.io/sps_tech Email:- [email protected] Twitter:- https://twitter.com/sps_tech_in Website:- https://sps-tech.in Instagram:- https://www.instagram.com/sps_tech_in/ Linkedin:- https://www.linkedin.com/in/sps-tech-in/ Github:- https://github.com/sumitpalsingh007 Consulting:- https://helloworldtechconsulting.com Do read my pick of the best basic Java interview questions:-https://sps-tech.in/interview-questions/ I recommend these books to enhance your knowledge of Java. Do check out:- Pragmatic Programmer, The: From Journeyman to Master:- https://amzn.to/3MEIuQw Scjp Sun Certified Programmer for Java 6 Study Guide (Exam 310 - 065) (Old Edition):- https://amzn.to/432mRPs Docker Deep Dive: Zero to Docker in a single book:- https://amzn.to/3IoTNtz Cloud Native Microservices with Spring and Kubernetes: Design and Build Modern Cloud Native Applications using Spring and Kubernetes (English Edition):- https://amzn.to/45dG96j Working Effectively with Legacy Code (Robert C. Martin Series):- https://amzn.to/3MHRxjJ Beginning Hibernate: For Hibernate 5:- https://amzn.to/3MjZ1YK Data Structures and Algorithms Made Easy in Java:- https://amzn.to/3IrQz8v Software Architecture in Practice (SEI Series in Software Engineering):- https://amzn.to/3MHYFN2 Java Concurrency In Practice:- https://amzn.to/3MiDeAM Data Structures & Algorithms in Java, 2e:- https://amzn.to/433SAjq