When to use @RunWith and when @ExtendWith

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

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@RunWith is an old annotation from JUnit 4 to use test runners. If you're using JUnit 5 (Jupiter), you should use @ExtendWith to use JUnit extensions.

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