JUnit 5 is the next generation of the JUnit testing framework for Java applications. Unlike JUnit 4's monolithic design, JUnit 5 consists of three modular subprojects:
Architecture:
- JUnit Platform: Foundation for launching testing frameworks on the JVM
- JUnit Jupiter: Programming and extension model for writing tests and extensions
- JUnit Vintage: Provides backward compatibility for JUnit 3 and 4 tests
Key Improvements from JUnit 4:
- Java 8+ Requirement: Leverages lambda expressions and functional interfaces
- Enhanced Annotations: More descriptive and flexible annotations
- Dynamic Tests: Runtime test generation capabilities
- Powerful Extension Model: Replaces runners with more flexible extensions
- Better Assertions: Improved assertion methods with lambda support
- Nested Test Organization: Better test structure with @Nested
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