java - JUnit test class order

Question

I have a java app with maven. Junit for tests, with failsafe and surefire plugins. I have more than 2000 integration tests. To speed up the test running, I use failsafe jvmfork to run my tests parallel. I have some heavy test class, and they typically running at end of my test execution and it is slows down my CI verify process. The filesafe runorder:balanced would be a good option for me, but i cant use it because the jvmfork. To rename the test classes or move to another package and run it alpahabetical is not an option. Any suggestion how can I run my slow test classes at the begining of the verify process?

Answer 1

In JUnit 5 (from version 5.8.0 onwards) test classes can be ordered too.

src/test/resources/junit-platform.properties:

# ClassOrderer$OrderAnnotation sorts classes based on their @Order annotation
junit.jupiter.testclass.order.default=org.junit.jupiter.api.ClassOrderer$OrderAnnotation

Other Junit built-in class orderer implementations:

org.junit.jupiter.api.ClassOrderer$ClassName
org.junit.jupiter.api.ClassOrderer$DisplayName
org.junit.jupiter.api.ClassOrderer$Random

^{For other ways (beside junit-platform.properties file) to set configuration parameters refer here.}

You can also provide your own orderer. It must implement ClassOrderer interface:

package foo;
public class MyOrderer implements ClassOrderer {
    @Override
    public void orderClasses(ClassOrdererContext context) {
        Collections.shuffle(context.getClassDescriptors());
    }
}

junit.jupiter.testclass.order.default=foo.MyOrderer

Note that @Nested test classes cannot be ordered by a ClassOrderer.

Refer to JUnit 5 documentations and ClassOrderer api docs to learn more about this.