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spring-bootannotationsjunit4junit5

When to use @RunWith and when @ExtendWith

My team and I have been working on a bunch of microservices using Spring boot. Since the services went through JUnit and Spring Boot upgrades (We're using now Spring Boot 2 and JUnit 5), different JUnit implemented by different devs, are now using different patterns with:

  • @ExtendWith
  • @RunWith

Today what's the difference between the two of them and do we really need them for our Unit Tests or are embedded in some new Spring Boot annotation?

Solution

  • The answer can be found in the documentation:

    If you are using JUnit 4, don’t forget to add @RunWith(SpringRunner.class)to your test, otherwise the annotations will be ignored. If you are using JUnit 5, there’s no need to add the equivalent @ExtendWith(SpringExtension.class) as @SpringBootTest and the other @…Testannotations are already annotated with it

    .