Posts tagged ‘NoClassDefFoundError’

June 29, 2011

Eclipse: Running all JUnit tests at once

by Stefan

When developing test driven it is essential to be able to run all existing unit tests over and over again as fast as possible. When the application gets larger the natural way to modularize is to distribute the code among multiple projects. I am not aware of tooling that ships with Eclipse and that allows you to run all JUnit tests based on a multi-project selection or on a selected working set.

I’ve used several workarounds in the past (Ant script, TestSuites, Maven build), but none was really satisfying. I recently stumbled upon the ClassPathSuite by Johannes Link which offers exactly what I was looking for. The library internally scans the classpath for classes with JUnit4 annotated methods and then executes all found tests. Sounds simple. This classpath-based solution also has the advantage that any Eclipse classpath container can be used so this works with OSGi-based bundles as well as with Maven projects, for instance.

Setup a ClassPathSuite test project

All you need to do is to create a new project and add a single class:

import org.junit.extensions.cpsuite.ClasspathSuite;
import org.junit.runner.RunWith;

@RunWith(ClasspathSuite.class)
public class RunAllTests {
}

If you’re with Maven, the library can be referenced like this (if not follow this link):

 <repositories>
    <repository>
      <id>http://maven.xwiki.org</id>
      <url>http://maven.xwiki.org/externals</url>
    </repository>
  </repositories>
  
  <dependencies>
    <dependency>
      <groupId>cpsuite</groupId>
      <artifactId>cpsuite</artifactId>
      <version>1.2.5</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

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