Interface ClassOrderer

All Known Implementing Classes:

ClassOrderer.ClassName, ClassOrderer.Default, ClassOrderer.DisplayName, ClassOrderer.OrderAnnotation, ClassOrderer.Random

@API(status=STABLE,
     since="5.10")
public interface ClassOrderer

ClassOrderer defines the API for ordering top-level test classes and @Nested test classes.

In this context, the term "test class" refers to any class containing methods annotated with @Test, @RepeatedTest, @ParameterizedTest, @TestFactory, or @TestTemplate.

Top-level test classes will be ordered relative to each other; whereas, @Nested test classes will be ordered relative to other @Nested test classes sharing the same enclosing class.

A ClassOrderer can be configured globally for the entire test suite via the "junit.jupiter.testclass.order.default" configuration parameter (see the User Guide for details) or locally for @Nested test classes via the @TestClassOrder annotation.

Built-in Implementations

JUnit Jupiter provides the following built-in ClassOrderer implementations.

• ClassOrderer.ClassName
• ClassOrderer.Default
• ClassOrderer.DisplayName
• ClassOrderer.OrderAnnotation
• ClassOrderer.Random

Since:

5.8

See Also:

• TestClassOrder
• ClassOrdererContext
• orderClasses(ClassOrdererContext)
• MethodOrderer

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	ClassOrderer.ClassName	ClassOrderer that sorts classes alphanumerically based on their fully qualified names using String.compareTo(String).
static final class	ClassOrderer.Default	ClassOrderer that allows to explicitly specify that the default ordering should be applied.
static class	ClassOrderer.DisplayName	ClassOrderer that sorts classes alphanumerically based on their display names using String.compareTo(String)
static class	ClassOrderer.OrderAnnotation	ClassOrderer that sorts classes based on the @Order annotation.
static class	ClassOrderer.Random	ClassOrderer that orders classes pseudo-randomly.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_ORDER_PROPERTY_NAME	Property name used to set the default class orderer class name: "junit.jupiter.testclass.order.default"

Method Summary

Modifier and Type	Method	Description
void	orderClasses(ClassOrdererContext context)	Order the classes encapsulated in the supplied ClassOrdererContext.

Field Details

DEFAULT_ORDER_PROPERTY_NAME

@API(status=STABLE,
     since="5.9")
static final String DEFAULT_ORDER_PROPERTY_NAME

Property name used to set the default class orderer class name: "junit.jupiter.testclass.order.default"

Supported Values

Supported values include fully qualified class names for types that implement ClassOrderer.

If not specified, test classes are not ordered unless test classes are annotated with @TestClassOrder.

Since:

5.8

See Also:

• Constant Field Values

Method Details

orderClasses

void orderClasses(ClassOrdererContext context)

Order the classes encapsulated in the supplied ClassOrdererContext.

The classes to order or sort are made indirectly available via ClassOrdererContext.getClassDescriptors(). Since this method has a void return type, the list of class descriptors must be modified directly.

For example, a simplified implementation of the ClassOrderer.Random ClassOrderer might look like the following.

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

Parameters:

context - the ClassOrdererContext containing the class descriptors to order; never null