Running specific set-up for tagged tests in JUnit 5

Jakub :

I'm using JUnit 5 with Java to write integration tests. Some of them connect to the database and I'm looking for a way to both:

• filter tests out
• run the database set-up (truncate tables, etc.) before tests

for tests annotated with a specific annotation.

So far I've found that using tags lets me do the following:

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.junit.jupiter.api.Tag;

@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Tag("database")
public @interface Database {}

and then use the @Database annotation to filter annotated tests out.

Now I'm looking for a solution to hook up a test set-up for all tests annotated with this annotation. What could it be?

johanneslink :

The solution requires two steps:

• Write a Jupiter extension e.g. MyDatabaseSetup that does the necessary setup/teardown work
• Add @ExtendWith(MyDatabaseSetup.class) to your Database annotation

Now every class or test method annotate with @Database will also use the extension.