spring boot boostrap bean override

Question

In my spring.factories I have such a definition:

org.springframework.cloud.bootstrap.BootstrapConfiguration=\
     MyBootstrapConfiguration

In MyBootstrapConfiguration I have:

@Configuration
public class MyBootstrapConfiguration {
    
     @Bean
     @ConditionalOnMissingBean
     public ApiClient apiClient() {
         return someClient;
     }
}

Now in my test ( junit-5 and @SpringBootTest ), I would like to override this bean. Notice the @ConditionalOnMissingBean ... If I can hook somehow to a "before" my bootstrap is started, to provide that ApiClient , that method apiClient would obviously not be called and I would be happy.

Please notice that MyBootstrapConfiguration is not something I have control of - its an invariant to me. For non-bootstrap configuration this is easily doable, but is there a way to do this for bootstrap?

Answer 1

Given a test configuration class:

@Configuration
public class TestBootstrapConfiguration implements Ordered {
    
    @Bean
    public ApiClient testApiClient() {
        return testApiClient;
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE;
    }
}

In src/test/resources/META-INF/spring.factories

org.springframework.cloud.bootstrap.BootstrapConfiguration=\
TestBootstrapConfiguration