Spring Boot allows us to replace our application.properties files with YAML equivalents. However, I seem to hit a snag with my tests. If I annotate my TestConfiguration (a simple Java config), it is expecting a properties file.

For example this doesn't work: @PropertySource(value = "classpath:application-test.yml")

If I have this in my YAML file:

db:
  url: jdbc:oracle:thin:@pathToMyDb
  username: someUser
  password: fakePassword

And I'd be leveraging those values with something like this:

@Value("${db.username}") String username

However, I end up with an error like so:

Could not resolve placeholder 'db.username' in string value "${db.username}"

How can I leverage the YAML goodness in my tests as well?