@Test
public void testGetMessages01() throws Exception {

    // 前処理
    DataSourceMessageSource ds = new DataSourceMessageSource();
    Locale locale = new Locale("ja", "JP", "");
    Properties props = new Properties();
    ds.cachedMergedProperties.put(locale, props);
    // テスト実施
    Properties returnProp = ds.getMessages(locale);
    // 判定
    assertSame(props, returnProp);
}