Spring Test ActiveProfiles is not reading the properties from the test properties file

Question

I have my custom properties defined in application.properties file located in src/main/resources folder. I want to add test cases for my application hence I added application-integration.properties in the src/test/resources folder as mentioned here. The test case is added as below

@SpringBootTest
@ActiveProfiles("integration")
public class ServiceATest {

    @Value("${app.api.url}")
    private String apiUrl;

    @Test
    public void testService() {
        Assertions.assertNotNull(apiUrl);
    }
}

The above test case fails. I do not understand why the properties are not read from application-integration.properties and nor from application.properties. The latter is not expected though still just for the understanding. Any idea what could be going wrong?

Thanks.