TestWatcher in junit5

Question

I can't find any annotation which replace/working the same like TestWatcher.

My goal: Have 2 functions which do something depend on test result.

• Success? Do something
• Fail? Do something else

Answer 1

The TestWatcher API was introduced here:

• https://github.com/junit-team/junit5/pull/1393
• https://junit.org/junit5/docs/5.4.0/release-notes/

Use it as follows:

1. Implement TestWatcher class (org.junit.jupiter.api.extension.TestWatcher)
2. Add @ExtendWith(<Your class>.class) to your tests classes (I personally use a base test class which I extend in every test) (https://junit.org/junit5/docs/current/user-guide/#extensions)

TestWatcher provides you with the following methods to do something on test abort, failed, success and disabled:

• testAborted​(ExtensionContext context, Throwable cause)
• testDisabled​(ExtensionContext context, Optional<String> reason)
• testFailed​(ExtensionContext context, Throwable cause)
• testSuccessful​(ExtensionContext context)

https://junit.org/junit5/docs/current/api/org/junit/jupiter/api/extension/TestWatcher.html

Sample TestWatcher implementation:

import java.util.Optional;

import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.TestWatcher;

public class MyTestWatcher implements TestWatcher {
    @Override
    public void testAborted(ExtensionContext extensionContext, Throwable throwable) {
        // do something
    }

    @Override
    public void testDisabled(ExtensionContext extensionContext, Optional<String> optional) {
        // do something
    }

    @Override
    public void testFailed(ExtensionContext extensionContext, Throwable throwable) {
        // do something
    }

    @Override
    public void testSuccessful(ExtensionContext extensionContext) {
        // do something
    }
}

Then you just put this on your tests:

@ExtendWith(MyTestWatcher.class)
public class TestSomethingSomething {
...