code: protected void addPropertySources(ConfigurableEnvironment environment,
  			ResourceLoader resourceLoader) {
  		RandomValuePropertySource.addToEnvironment(environment);
  		new Loader(environment, resourceLoader).load();
  	}
docs: Add config file property sources to the specified environment.
  @param environment the environment to add source to
  @param resourceLoader the resource loader
  @see #addPostProcessors(ConfigurableApplicationContext)