September 12th, 2017

What’s new in JUnit 5 for Java testing

Development Tools, Java App Dev, Open Source, others, Programing, Testing and Debugging, by admin.

The JUnit testing framework for Java has just moved to version 5. Unlike previous releases, JUnit 5 features modules from several subprojects, including:

  • Platform, for launching testing frameworks on the JVM and defining the TestEngine API via a command line.
  • Jupiter, for programming and extension models for writing tests and extensions and then (via plugins) building them within JUnit, Gradle, or Maven.
  • Vintage, for running JUnit 3 and 4 tests on the JUnit 5 platform.

In Jupiter, a developer can use annotations as meta-annotations, in which you define an annotation that automatically inherits the semantics of meta-annotations—a new programming model in JUnit. Also, Jupiter lets test constructors and methods to have parameters, allowing for more flexibility and enabling dependency injection for constructors and methods.

JUnit 5 requires Java 8 or higher version at runtime. But developers still can test code previous versions of the Java Development Kit. JUnit 5 artifacts do not ship with compiled module descriptors for JDK 9, but there are accommodations for JDK 9. Tests can be run on the java class path; in this regard, there are no changes between Java 8 and 9, according to documentation. Also, running JUnit Jupiter tests on the module path is implemented by pro, a Java 9-compatible build tool.

This story, “What’s new in JUnit 5 for Java testing” was originally published by InfoWorld.

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