Difference between JUnit 4 and JUnit 5

JUnit 4 and JUnit 5 are both popular Java testing frameworks, but they have some key differences:

1. Architecture: JUnit 4 follows a classic architecture, while JUnit 5 is based on a modular architecture with separate modules for different functionalities.
2. Annotations: JUnit 5 introduced several new annotations like @BeforeEach, @AfterEach, and @DisplayName, providing more flexibility and readability compared to JUnit 4.
3. Assertions: JUnit 5 offers new assert methods like assertAll(), assertTimeout(), and assertThrows() for more comprehensive and robust testing.
4. Extension Model: JUnit 5 comes with a new extension model that allows developers to create custom extensions and use them in test classes.

Why Choose JUnit 4 or JUnit 5?

When it comes to choosing between JUnit 4 and JUnit 5 for your testing needs, consider the following:

• Legacy Code: If you are working on legacy codebases that are already using JUnit 4, it may be easier to stick with JUnit 4 for compatibility reasons.
• New Features: If you require the newer features and enhancements offered by JUnit 5, such as improved annotations and assertion methods, then JUnit 5 would be the better choice.
• Modularity: If you prefer a more modular testing framework with better support for extension and customization, JUnit 5's modular architecture is a significant advantage.

Ultimately, the choice between JUnit 4 and JUnit 5 will depend on your specific project requirements and preferences.