JUnit test class order

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 to set configuration parameters (beside junit-platform.properties file) see JUnit 5 user guide.}

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.