SpringRunner vs SpringBootTest
JavaSpring BootJunitSpring Boot-TestJava Problem Overview
In unit test, what are the differences between @Runwith(SpringRunner.class)
& @SpringBootTest
?
Can you explain to me the use cases of each one?
Java Solutions
Solution 1 - Java
@RunWith(SpringRunner.class) : You need this annotation to just enable spring boot features like @Autowire
, @MockBean
etc.. during junit testing
>is used to provide a bridge between Spring Boot test features and JUnit. Whenever we are using any Spring Boot testing features in our JUnit tests, this annotation will be required.
@SpringBootTest : This annotation is used to load complete application context for end to end integration testing
>The @SpringBootTest annotation can be used when we need to bootstrap the entire container. The annotation works by creating the ApplicationContext that will be utilized in our tests.
Here is the article with clear examples on both scenarios Baeldung
Solution 2 - Java
@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 4, don’t forget to also 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 @…Test annotations are already annotated with it.
Solution 3 - Java
From spring.io :
> @RunWith(SpringRunner.class)
tells JUnit to run using Spring’s testing
> support. SpringRunner
is the new name for SpringJUnit4ClassRunner
,
> it’s just a bit easier on the eye.
> @SpringBootTest
is saying “bootstrap with Spring Boot’s support” (e.g.
> load application.properties
and give me all the Spring Boot goodness)
So if you don't need everything that Spring Boot loads for your integration test, you may not need @SpringBootTest