How to get JUnit version - windows

Question

How to know which version of JUnit do I have installed on my PC?
Second question- How do I upgrade it?

Answer 1

This will print the version of jUnit.
java -cp <path-to-junit-folder>/junit.jar junit.runner.Version

Answer 2

The version that you are running depends on the classpath of the running application. It's possible to have multiple versions on the same machine, but if this is in question you can just write a test for it:
import junit.runner.Version;
class SomeTests {
void testJUnitVersion() {
assertEquals("4.8.2", Version.id());
}
}

Answer 3

To upgrade to a newer version of JUnit, you just have to download the new version and replace the old version with the new jar. It's as simple as that.
There isn't really a nice way to tell which version of JUnit you're currently using, unless you're using maven or something like that. In general, you can tell between
JUnit 3: if you're using the junit.framework.* classes
JUnit 4: if you're using the org.junit.* classes (the tests have #Test annotations on them)
In general, JUnit is backward compatible (JUnit 3 tests can be run under JUnit 4), but JUnit 4 is recommended.

Answer 4

Eclipse shows its runner version on JUnit view when you run your tests

Answer 5

In netbeans in the projects window, expand the test libraries folder of a project that has a test in it. It will say the version in the name of the jar file.

Answer 6

With JUnit 5 you can do something like this:
import java.util.ServiceLoader;
import org.junit.platform.engine.TestEngine;
import java.util.Iterator;
 
final ServiceLoader<TestEngine> loader = ServiceLoader.load(TestEngine.class);
final Iterator<TestEngine> iterator = loader.iterator();
final TestEngine testEngine = iterator.next();
final String version = testEngine.getVersion().get();
Upgrade process depends on your project structure. If it’s a Maven project, you can set the version in your pom.xml. If it’s still unclear I recommend creating another question for your specific build environment.