Dfyjkt

Assume we have Spring Boot application and want to load only specific slice of application context.

Particularly load YAML file configuration and map spring.datasource to DataSourceProperties marked by @ConfigurationProperties.

Naive not working declaration of test is:

@RunWith(SpringRunner.class)
@ContextConfiguration(
 classes = DataSourceAutoConfiguration.class, DataSourceProperties.class,
 loader = AnnotationConfigContextLoader.class,
 initializers = ConfigFileApplicationContextInitializer.class)
@TestPropertySource("classpath:application.yaml", "classpath:application-dev.yaml")
@EnableConfigurationProperties(DataSourceProperties.class)
@Slf4j
public class HibernateTest 
 @Autowired
 private DataSourceProperties dataSourceProperties;

 @Test
 public void dataSourceTest() throws SQLException 
 log.info("DS URL: ", dataSourceProperties.getUrl());
 

application-dev.yaml has:

spring.datasource:
 url: jdbc:oracle:thin:@localhost:1521/APP

Test prints:

DS URL: null

I am looking for a way to map YAML config to @ConfigurationProperties marked class (DataSourceProperties) and make it used by @Configuration class (DataSourceAutoConfiguration) without loading any other services/components/etc...

Those links answer my questions:

• 
  https://jira.spring.io/browse/SPR-13912
  Add support for YAML files to @PropertySource (Resolution: Unresolved).


• 
  https://jira.spring.io/browse/SPR-16563
  Document that @PropertySource and @TestPropertySource do not support YAML.


• 
  https://github.com/spring-projects/spring-boot/issues/12388
  Property Override not Working For YML Files.


• 
  https://github.com/spring-projects/spring-boot/issues/10772
  Map properties in yaml from TestPropertySource not working in boot 2.0.0.

In short Spring Framework developers don't want to support YAML format for @TestPropertySource & @PropertySource annotation explaining that YAML support in Spring Boot made in tricky way / broken way (though I lost in explanations).

After switching code to use .properties files my test works fine.