JUnit Series
Last updated: September 28, 2023
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
Yes, we're now running our only Summer Sale. All Courses are 30% off until 20th July, 2026:
Yes, we're now running our only Summer Sale. All Courses are 30% off until 20th July, 2026:
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JUnit – Testing Basics
- A Guide to JUnit 5+
- JUnit 5 @Test Annotation
- @Before vs @BeforeClass vs @BeforeEach vs @BeforeAll
- Assert an Exception Is Thrown in JUnit 4 and 5
- Assertions in JUnit 4 and JUnit 5
- Best Practices for Unit Testing in Java
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JUnit – Integration with Other Libraries
- The SpringJUnitConfig and SpringJUnitWebConfig Annotations in Spring
- Mockito and JUnit 5 – Using ExtendWith
- A Quick JUnit vs TestNG Comparison
- Guide to Selenium with JUnit / TestNG
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JUnit – Advanced Topics
- The Order of Tests in JUnit
- Custom JUnit 4 Test Runners
- JUnit5 @RunWith
- Inject Parameters into JUnit Jupiter Unit Tests
- Migrating from JUnit 4 to JUnit 5
- A Guide to JUnit 5 Extensions
- JUnit5 Programmatic Extension Registration with @RegisterExtension
- Guide to Dynamic Tests in Junit 5
- A Guide to @RepeatedTest in JUnit 5+
- Failed to Load ApplicationContext for JUnit Test of Spring Controller
- @DataJpaTest and Repository Class in JUnit
- Running a Single Test or Method With Maven
- Get the Path of the /src/test/resources Directory in JUnit
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