SpringBoot Support bean override for Spring Boot Test

In our application some beans are created for invoking third part service. Sometime we don't expect to or can't create these beans in @SpringBootTest context. I hope we can create mock to replace these beans more easier.

Like for instant, I defined an s3Service bean in my @Configuration class

@Configuration
public class S3Configuration {
    @Bean
    public S3Service s3Service() {
        // ....
    }
}

What I want is I can defined a mock bean to replace it in my @TestConfiguration class

@TestConfiguration
public class S3ServiceMockConfig {
    @Bean
    public S3Service s3Service() {
        return mock(S3Service.class);
    }
}

Currently, we can't do that, when spring find out two beans with same type and name, it will throw exception. Although I can change the name of the mock bean and mark it as @Primary, but it doesn't work for those injections that use @Qualifier.

The another way is to conditional create these beans.

@Configuration
public class S3Configuration {
    @ConditionalOnProperty(name = "runtime_unit_test", havingValue = "false")
    @Bean
    public S3Service s3Service() {
        // ....
    }
}

But It doesn't make sense to write my production code like this for a testing purpose.

Best regards

Comment From: snicoll

Have you tried @MockBean?