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spring boot - 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?

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If you are using Junit version < 5, so you have to use @RunWith(SpringRunner.class) or @RunWith(MockitoJUnitRunner.class) etc.

If you are using Junit version = 5, so you have to use @ExtendWith(SpringExtension.class) or @ExtendWith(MockitoExtension.class) etc.

  1. SpringRunner
  2. MockitoJUnitRunner
  3. SpringExtension
  4. MockitoExtension

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