ClassOrderer that sorts classes alphanumerically based on their fully qualified names using String#compareTo(String).

ClassOrderer that allows to explicitly specify that the default ordering should be applied.

If the junit.jupiter.testclass.order.default is set, specifying this ClassOrderer has the same effect as referencing the configured class directly. Otherwise, it has the same effect as not specifying any ClassOrderer.

This class can be used to reset the ClassOrderer for a @Nested class and its @Nested inner classes, recursively, when a ClassOrderer is configured using @TestClassOrder on an enclosing class.

public void orderClasses(ClassOrdererContext context) {
    Collections.shuffle(context.getClassDescriptors());
}

ClassOrderer that sorts classes alphanumerically based on their display names using String#compareTo(String)

ClassOrderer that sorts classes based on the @Order annotation.

Any classes that are assigned the same order value will be sorted arbitrarily adjacent to each other.

Any classes not annotated with @Order will be assigned the default order value which will effectively cause them to appear at the end of the sorted list, unless certain classes are assigned an explicit order value greater than the default order value. Any classes assigned an explicit order value greater than the default order value will appear after non-annotated classes in the sorted list.

ClassOrderer that orders classes pseudo-randomly.

Custom Seed

By default, the random seed used for ordering classes is the value returned by System#nanoTime() during static class initialization. In order to support repeatable builds, the value of the default random seed is logged at CONFIG level. In addition, a custom seed (potentially the default seed from the previous test plan execution) may be specified via the junit.jupiter.execution.order.random.seed configuration parameter which can be supplied via the Launcher API, build tools (e.g., Gradle and Maven), a JVM system property, or the JUnit Platform configuration file (i.e., a file named junit-platform.properties in the root of the class path). Consult the User Guide for further information.