Module org.junit.jupiter.engine

Package org.junit.jupiter.engine.extension

Interface ExtensionRegistrar

All Known Implementing Classes:

MutableExtensionRegistry

@API(status=INTERNAL,
     since="5.5")
public interface ExtensionRegistrar

An ExtensionRegistrar is used to register extensions.

Since:

5.5

Method Summary

Modifier and Type	Method	Description
void	initializeExtensions(Class<?> testClass, Object testInstance)	Initialize all registered extensions for the supplied testClass using the supplied testInstance.
void	registerExtension(Class<? extends Extension> extensionType)	Instantiate an extension of the given type using its default constructor and register it in the registry.
void	registerExtension(Extension extension, Object source)	Register the supplied Extension, without checking if an extension of that type has already been registered.
void	registerSyntheticExtension(Extension extension, Object source)	Register the supplied Extension as a synthetic extension, without checking if an extension of that type has already been registered.
void	registerUninitializedExtension(Class<?> testClass, Field source, Function<Object,? extends Extension> initializer)	Register an uninitialized extension for the supplied testClass to be initialized using the supplied initializer when an instance of the test class is created.

Method Details

registerExtension

void registerExtension(Class<? extends Extension> extensionType)

Instantiate an extension of the given type using its default constructor and register it in the registry.

A new Extension should not be registered if an extension of the given type already exists in the registry or a parent registry.

Parameters:

extensionType - the type of extension to register

Since:

5.8

registerExtension

void registerExtension(Extension extension,
 Object source)

Register the supplied Extension, without checking if an extension of that type has already been registered.

Semantics for Source

If an extension is registered declaratively via @ExtendWith, the source and the extension should be the same object. However, if an extension is registered programmatically via @RegisterExtension, the source object should be the Field that is annotated with @RegisterExtension. Similarly, if an extension is registered programmatically as a lambda expression or method reference, the source object should be the underlying Method that implements the extension API.

Parameters:

extension - the extension to register; never null

source - the source of the extension; never null

registerSyntheticExtension

void registerSyntheticExtension(Extension extension,
 Object source)

Register the supplied Extension as a synthetic extension, without checking if an extension of that type has already been registered.

Parameters:

extension - the extension to register; never null

source - the source of the extension; never null

Since:

5.8

See Also:

• registerExtension(Extension, Object)

registerUninitializedExtension

void registerUninitializedExtension(Class<?> testClass,
 Field source,
 Function<Object,? extends Extension> initializer)

Register an uninitialized extension for the supplied testClass to be initialized using the supplied initializer when an instance of the test class is created.

Uninitialized extensions are typically registered for fields annotated with @RegisterExtension that cannot be initialized until an instance of the test class is created. Until they are initialized, such extensions are not available for use.

Parameters:

testClass - the test class for which the extension is registered; never null

source - the source of the extension; never null

initializer - the initializer function to be used to create the extension; never null

initializeExtensions

void initializeExtensions(Class<?> testClass,
 Object testInstance)

Initialize all registered extensions for the supplied testClass using the supplied testInstance.

Parameters:

testClass - the test class for which the extensions are initialized; never null

testInstance - the test instance to be used to initialize the extensions; never null