java.lang.Object
- org.junit.rules.ExternalResource
- - akka.actor.testkit.typed.javadsl.TestKitJunitResource

All Implemented Interfaces:

org.junit.rules.TestRule
```
public final class TestKitJunitResource
extends org.junit.rules.ExternalResource
```
A Junit external resource for the ActorTestKit, making it possible to have Junit manage the lifecycle of the testkit. The testkit will be automatically shut down when the test completes or fails.
Note that Junit is not provided as a transitive dependency of the testkit module but must be added explicitly to your project to use this.
Example:
```
 public class MyActorTest {
   @ClassRule
   public static final TestKitResource testKit = new TestKitResource();

   @Test
   public void testBlah() throws Exception {
           // spawn actors etc using the testKit
           ActorRef<Message> ref = testKit.spawn(behavior);
   }
 }
 
```
By default config is loaded from application-test.conf if that exists, otherwise using default configuration from the reference.conf resources that ship with the Akka libraries. The application.conf of your project is not used in this case. A specific configuration can be passed as constructor parameter.

Constructor Summary

Constructors
Constructor	Description
`TestKitJunitResource()`	Config loaded from `application-test.conf` if that exists, otherwise using default configuration from the reference.conf resources that ship with the Akka libraries.
`TestKitJunitResource(ActorTestKit _kit)`
`TestKitJunitResource(ActorSystem<?> system)`	Use a custom `ActorSystem` for the actor system.
`TestKitJunitResource(com.typesafe.config.Config customConfig)`	Use a custom config for the actor system.
`TestKitJunitResource(com.typesafe.config.Config customConfig, TestKitSettings settings)`	Use a custom config for the actor system, and a custom `TestKitSettings`.
`TestKitJunitResource(java.lang.String customConfig)`	Use a custom config for the actor system.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`after()`
`TestProbe<DeadLetter>`	`createDeadLetterProbe()`	See corresponding method on `ActorTestKit`
`TestProbe<Dropped>`	`createDroppedMessageProbe()`	See corresponding method on `ActorTestKit`
`<M> TestProbe<M>`	`createTestProbe()`	See corresponding method on `ActorTestKit`
`<M> TestProbe<M>`	`createTestProbe(java.lang.Class<M> clazz)`	See corresponding method on `ActorTestKit`
`<M> TestProbe<M>`	`createTestProbe(java.lang.String name)`	See corresponding method on `ActorTestKit`
`<M> TestProbe<M>`	`createTestProbe(java.lang.String name, java.lang.Class<M> clazz)`	See corresponding method on `ActorTestKit`
`TestProbe<UnhandledMessage>`	`createUnhandledMessageProbe()`	See corresponding method on `ActorTestKit`
`Scheduler`	`scheduler()`	See corresponding method on `ActorTestKit`
`SerializationTestKit`	`serializationTestKit()`	Additional testing utilities for serialization.
`<T> ActorRef<T>`	`spawn(Behavior<T> behavior)`	See corresponding method on `ActorTestKit`
`<T> ActorRef<T>`	`spawn(Behavior<T> behavior, Props props)`	See corresponding method on `ActorTestKit`
`<T> ActorRef<T>`	`spawn(Behavior<T> behavior, java.lang.String name)`	See corresponding method on `ActorTestKit`
`<T> ActorRef<T>`	`spawn(Behavior<T> behavior, java.lang.String name, Props props)`	See corresponding method on `ActorTestKit`
`<T> void`	`stop(ActorRef<T> ref)`	See corresponding method on `ActorTestKit`
`<T> void`	`stop(ActorRef<T> ref, java.time.Duration max)`	See corresponding method on `ActorTestKit`
`ActorSystem<java.lang.Void>`	`system()`	See corresponding method on `ActorTestKit`
`ActorTestKit`	`testKit()`
`TestKitSettings`	`testKitSettings()`	See corresponding method on `ActorTestKit`
`Timeout`	`timeout()`	See corresponding method on `ActorTestKit`

Methods inherited from class org.junit.rules.ExternalResource
apply, before

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- TestKitJunitResource
```
public TestKitJunitResource(ActorTestKit _kit)
```
- TestKitJunitResource
```
public TestKitJunitResource()
```
  Config loaded from application-test.conf if that exists, otherwise using default configuration from the reference.conf resources that ship with the Akka libraries. The application.conf of your project is not used in this case.
- TestKitJunitResource
```
public TestKitJunitResource(ActorSystem<?> system)
```
  Use a custom ActorSystem for the actor system.
- TestKitJunitResource
```
public TestKitJunitResource(java.lang.String customConfig)
```
  Use a custom config for the actor system.
- TestKitJunitResource
```
public TestKitJunitResource(com.typesafe.config.Config customConfig)
```
  Use a custom config for the actor system.
- TestKitJunitResource
```
public TestKitJunitResource(com.typesafe.config.Config customConfig,
                            TestKitSettings settings)
```
  Use a custom config for the actor system, and a custom TestKitSettings.

Method Detail

after
```
public void after()
```
Overrides:

after in class org.junit.rules.ExternalResource

createDeadLetterProbe
```
public TestProbe<DeadLetter> createDeadLetterProbe()
```
See corresponding method on ActorTestKit

createDroppedMessageProbe
```
public TestProbe<Dropped> createDroppedMessageProbe()
```
See corresponding method on ActorTestKit

createTestProbe
```
public <M> TestProbe<M> createTestProbe()
```
See corresponding method on ActorTestKit