@Override
  @CheckForNull
  public String message(Locale locale, String key, @Nullable String defaultValue, Object... parameters) {
    String bundleKey = propertyToBundles.get(key);
    String value = null;
    if (bundleKey != null) {
      try {
        ResourceBundle resourceBundle = ResourceBundle.getBundle(bundleKey, locale, classloader, control);
        value = resourceBundle.getString(key);
      } catch (MissingResourceException e1) {
        // ignore
      }
    }
    if (value == null) {
      value = defaultValue;
    }
    return formatMessage(value, parameters);
  }
@Test
  public void load_core_bundle() {
    assertThat(underTest.message(Locale.ENGLISH, "any", null)).isEqualTo("Any");
  }