Override default Spring-Boot application.properties settings in Junit Test with dynamic value

Question

I want to override properties defined in application.properties in tests, but @TestPropertySource only allows to provide predefined values.

What I need is to start a

Answer 1

Thanks to the changes made in Spring Framework 5.2.5, the use of @ContextConfiguration and the ApplicationContextInitializer can be replaced with a static @DynamicPropertySource method that serves the same purpose.

@SpringBootTest
@Testcontainers
class SomeSprintTest {

    @Container
    static LocalStackContainer localStack = 
        new LocalStackContainer().withServices(LocalStackContainer.Service.S3);

    @DynamicPropertySource
    static void initialize(DynamicPropertyRegistry registry) {
        AwsClientBuilder.EndpointConfiguration endpointConfiguration = 
            localStack.getEndpointConfiguration(LocalStackContainer.Service.S3);

        registry.add("cloud.aws.s3.default-endpoint", endpointConfiguration::getServiceEndpoint);
    }
}