@Override
  public MapSettings setProperty(String key, String value) {
    return (MapSettings) super.setProperty(key, value);
  }
@Test
  public void should_load_values_of_deprecated_key() {
    Settings settings = new MapSettings(definitions);
    settings.setProperty("oldKey", "a,b");

    assertThat(settings.getStringArray("newKey")).containsOnly("a", "b");
    assertThat(settings.getStringArray("oldKey")).containsOnly("a", "b");
  }