Posted August 6, 2023 by Rohith and Anusha ‐ 3 min read

In the fast-paced world of software development, the significance of comprehensive and reliable testing cannot be overstated. Enter JUnit 5, the latest version of the widely-used Java testing framework. JUnit 5 builds upon the success of its predecessors and introduces a plethora of features and improvements, enabling developers to write cleaner, more expressive, and efficient tests.

What is JUnit 5?

  • JUnit 5 is the next iteration of the JUnit testing framework for Java.

  • It was released in 2017 and brought substantial changes and enhancements to the testing ecosystem.

  • The framework aims to make testing more flexible, modular, and developer-friendly.

  • JUnit 5 is designed to be backward-compatible with JUnit 4, ensuring a smooth transition for existing projects.

Key Features and Improvements

Enhanced Architecture

  • JUnit 5 is designed with a more modular architecture, consisting of three main components: JUnit Platform, JUnit Jupiter, and JUnit Vintage.

  • The JUnit Platform serves as the foundation for running tests on different environments, while JUnit Jupiter provides the new programming model for writing tests.

  • JUnit Vintage allows running tests written in previous JUnit versions.

New Annotations and APIs

  • JUnit 5 introduces several new annotations and APIs to make test writing more expressive and flexible.

  • Annotations like @Test, @BeforeEach, @AfterEach, @BeforeAll, and @AfterAll enable developers to define test cases and setup/teardown methods with ease.

Parameterized Tests

  • JUnit 5 brings built-in support for parameterized tests, allowing developers to execute the same test logic with different input arguments.

  • This simplifies testing scenarios with multiple inputs, leading to more concise and maintainable test code.

Repeated Tests

  • In situations where tests need to be run multiple times to ensure stability and consistency, JUnit 5’s @RepeatedTest annotation comes to the rescue.

  • It allows developers to repeat test execution a specified number of times effortlessly.

Conditional Test Execution

  • JUnit 5 introduces conditional test execution through the @EnabledOnOs, @EnabledIfSystemProperty, and other similar annotations.

  • This enables tests to run only on specific environments or when certain system properties are met.

Dynamic Tests

  • Dynamic tests allow developers to generate tests at runtime, enabling the creation of tests based on data from external sources or complex scenarios.

  • This feature promotes more versatile and data-driven testing.

Improved Assertions

  • JUnit 5 includes an enhanced assertion API with better error messages, making it easier to diagnose test failures.

  • The new assertAll() method groups multiple assertions together, ensuring that all assertions within a group are executed even if one of them fails.

Getting Started with JUnit 5

  • To start using JUnit 5 in your Java projects, you’ll need to include the appropriate JUnit 5 dependencies in your build system (Maven or Gradle).

  • Once set up, you can create test classes with JUnit Jupiter annotations and start writing your tests.

  • JUnit 5 provides excellent integration with popular IDEs and build tools, making it effortless to run tests and view results directly within your development environment.


  • JUnit 5 has revolutionized Java testing, providing developers with a modern and feature-rich framework for writing robust and expressive tests.

  • Its enhanced architecture, flexible annotations, parameterized tests, and dynamic test generation capabilities have significantly improved the testing landscape in the Java ecosystem.

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