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- JUnit Tutorial: Overview
JUnit Tutorial
JUnit tutorial for Java developers and testers: what JUnit is and the 27 chapters in reading order, from setup and annotations to Mockito and JUnit 6.
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JUnit is the standard open-source testing framework for Java. You mark methods with @Test, check the results with assertions, and JUnit discovers and runs them from your IDE, Maven, or Gradle. It belongs to the xUnit family and covers unit tests first, plus integration and browser tests when paired with tools such as Selenium.
JUnit 5 (Jupiter) is the version most teams write today. JUnit 6, released on September 30, 2025, keeps the same Jupiter API and raises the baseline to Java 17, so the chapters apply to both. You need Java 17 or newer (Java 8 or newer for JUnit 5), Maven or Gradle or an IDE such as IntelliJ IDEA or Eclipse, and basic Java. No prior testing framework is assumed.
This JUnit tutorial is a course of 27 chapters, listed below in reading order. Each chapter is a runnable example on one topic, and the same list sits in the Chapters panel on every page.
JUnit Tutorial Chapters
Below is the list of topics covered in the next chapters of the JUnit tutorial.
- What Is JUnit
- JUnit Setup
- JUnit Maven Dependency
- JUnit Test Cases
- Unit Testing in Java
- Run JUnit from Command Line
- JUnit Annotations
- JUnit Test Order
- JUnit Ignore Test
- JUnit Repeated Tests
- JUnit Assertions
- JUnit Exception Testing
- JUnit ErrorCollector
- JUnit Parameterized Tests
- JUnit Nested Tests
- JUnit Test Suites
- JUnit Jupiter
- JUnit Parallel Testing
- JUnit Reports
- JUnit with Selenium
- Mockito with JUnit
- JUnit Extensions
- JUnit 4 vs JUnit 5
- JUnit 6 Features
- JUnit 6 Migration
- JUnit vs TestNG
- JUnit Interview Questions
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Author
Himanshu Sheth
Blogs: 144
Himanshu Sheth is the Director of Marketing (Technical Content) at TestMu AI, with over 8 years of hands-on experience in Selenium, Cypress, and other test automation frameworks. He has authored more than 130 technical blogs for TestMu AI, covering software testing, automation strategy, and CI/CD. At TestMu AI, he leads the technical content efforts across blogs, YouTube, and social media, while closely collaborating with contributors to enhance content quality and product feedback loops. He has done his graduation with a B.E. in Computer Engineering from Mumbai University. Before TestMu AI, Himanshu led engineering teams in embedded software domains at companies like Samsung Research, Motorola, and NXP Semiconductors. He is a core member of DZone and has been a speaker at several unconferences focused on technical writing and software quality.
Reviewer
Srinivasan Sekar
Reviewer
Srinivasan Sekar is Director of Engineering at TestMu AI, where he leads engineering and open-source initiatives behind the Selenium and Appium automation grid and owns TestMu AI's MCP Server. A committer to Appium and a contributor to Selenium, WebdriverIO, Taiko, and AppiumTestDistribution, he brings over 15 years of experience in quality engineering and open-source technologies. He is the author of the Apress book 'The MCP Standard: A Developer's Guide to Building Universal AI Tools with the Model Context Protocol,' a Certified Kubernetes and Cloud Native Associate, and an international conference speaker. Before TestMu AI he spent over eight years at Thoughtworks as a Principal Consultant and Quality Architect. Srinivasan holds a B.Tech in Information Technology from Anna University.
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