What is the difference between JUnit 4 and JUnit 5?

JUnit 4 and JUnit 5 are both popular Java testing frameworks, but they have some key differences that developers should be aware of. One significant difference is the architecture and features offered by each version.

JUnit 4: JUnit 4 has been around for many years and is known for its simplicity and ease of use. It follows a more traditional test architecture with annotations like @Test.

JUnit 5: JUnit 5, on the other hand, introduced some major changes such as the modular architecture. It includes features like nested tests, parameterized tests, dynamic tests, and more, making it a more flexible and powerful testing framework.

Another key difference is that JUnit 5 requires Java 8 or higher, while JUnit 4 is compatible with older versions of Java.

In conclusion, while JUnit 4 is a solid and reliable choice for testing Java applications, JUnit 5 offers more modern features and flexibility for developers.