What problem are you trying to solve?

As part of migrating from JUnit 4 to 5, we need to use the new Testcontainer Extension APIs.

What precondition(s) should be checked before applying this recipe?

JUnit 4 to 5 migration preconditions is sufficient

Describe the situation before applying the recipe

public class SimpleMySQLTest {
    @Rule
    public MySQLContainer mysql = new MySQLContainer();
}

Describe the situation after applying the recipe

@Testcontainers
public class SimpleMySQLTest {
    @Container
    public MySQLContainer mysql = new MySQLContainer();
}

Have you considered any alternatives or workarounds?

Any additional context

Are you interested in contributing this recipe to OpenRewrite?

Yes, I have mostly written this recipe (see attached PR)