Spring Boot properties in 'application.yml' not loading from JUnit Test

Question

What am I doing wrong? I'm using this little standalone App which runs and finds my src/main/resources/config/application.yml. The same configuration doesn't work from JUnit, see below:

@Configuration @ComponentScan @EnableConfigurationProperties  public class TestApplication {      public static void main(String[] args) {          SpringApplication.run(TestApplication.class);     } }   @Component @ConfigurationProperties  public class Bean{     ... } 

The following doesn't work, the same properties in application.yml are not loaded and Bean has only null values:

@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = TestApplication.class)  public class SomeTestClass {     ... } 

Answer 1

Try this:

@RunWith(SpringJUnit4ClassRunner.class) @SpringApplicationConfiguration(classes = TestApplication.class,      initializers = ConfigFileApplicationContextInitializer.class) public class SomeTestClass {     ... } 

EDIT:

For Spring Boot version 1.5+, SpringApplicationConfiguration was removed in favour of SpringBootTest or direct use of SpringBootContextLoader.

You can still use initializers parameter with ContextConfiguration annotation.

Answer 2

The trick to load any custom yml file in SpringBoot 2.0 w/o using @SpringBootTest

• create some yml file in test\resources
• Use ConfigFileApplicationContextInitializer and spring.config.location property

Example Code:

@RunWith(SpringRunner.class) @ContextConfiguration(     classes = { MyConfiguration.class, AnotherDependancy.class },     initializers = {ConfigFileApplicationContextInitializer.class} ) @TestPropertySource(properties = { "spring.config.location=classpath:myApp-test.yml" }) public class ConfigProviderTest {     @Autowired     private MyConfiguration myConfiguration; //this will be filled with myApp-test.yml      @Value("${my.config-yml-string}")    private String someSrting; //will get value from the yml file.  } 

For JUnit 5 use the @ExtendWith(SpringExtension.class) annotation instead of @RunWith(SpringRunner.class)