@Test
public void resolve() {

  Configuration conf = new Configuration(false);
  conf.set("a", "A");
  conf.set("b", "${a}");
  assertEquals(conf.getRaw("a"), "A");
  assertEquals(conf.getRaw("b"), "${a}");
  conf = ConfigurationUtils.resolve(conf);
  assertEquals(conf.getRaw("a"), "A");
  assertEquals(conf.getRaw("b"), "A");
}