org.junit.jupiter.api

Interface MethodOrderer

All Known Implementing Classes:

MethodOrderer.Alphanumeric, MethodOrderer.OrderAnnotation, MethodOrderer.Random

@API(status=EXPERIMENTAL,
     since="5.4")
public interface MethodOrderer

MethodOrderer defines the API for ordering the test methods in a given test class.

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

Built-in Implementations

JUnit Jupiter provides the following built-in MethodOrderer implementations.

• MethodOrderer.Alphanumeric
• MethodOrderer.OrderAnnotation
• MethodOrderer.Random

Since:

5.4

See Also:

TestMethodOrder, MethodOrdererContext, orderMethods(MethodOrdererContext)

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	MethodOrderer.Alphanumeric MethodOrderer that sorts methods alphanumerically based on their names using String.compareTo(String).
static class	MethodOrderer.OrderAnnotation MethodOrderer that sorts methods based on the @Order annotation.
static class	MethodOrderer.Random MethodOrderer that orders methods pseudo-randomly and allows for concurrent execution by default.

Method Summary

Modifier and Type	Method and Description
default Optional<ExecutionMode>	getDefaultExecutionMode() Get the default ExecutionMode for the test class configured with this MethodOrderer.
void	orderMethods(MethodOrdererContext context) Order the methods encapsulated in the supplied MethodOrdererContext.

Method Detail

orderMethods

void orderMethods(MethodOrdererContext context)

Order the methods encapsulated in the supplied MethodOrdererContext.

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

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

 public void orderMethods(MethodOrdererContext context) {
     Collections.shuffle(context.getMethodDescriptors());
 }
 

Parameters:

context - the MethodOrdererContext containing the method descriptors to order; never null

See Also:

getDefaultExecutionMode()

getDefaultExecutionMode

default Optional<ExecutionMode> getDefaultExecutionMode()

Get the default ExecutionMode for the test class configured with this MethodOrderer.

This method is guaranteed to be invoked after orderMethods(MethodOrdererContext) which allows implementations of this method to determine the appropriate return value programmatically, potentially based on actions that were taken in orderMethods().

Defaults to SAME_THREAD, since ordered methods are typically sorted in a fashion that would conflict with concurrent execution.

In case the ordering does not conflict with concurrent execution, implementations should return an empty Optional to signal that the engine should decide which execution mode to use.

Can be overridden via an explicit @Execution declaration on the test class or in concrete implementations of the MethodOrderer API.

Returns:

the default ExecutionMode; never null but potentially empty

See Also:

orderMethods(MethodOrdererContext)