@Test
public void getMessage() {

    ResourceBundle bundle = ResourceBundle.getBundle(MessageUtilTest.class.getName());
    String key = "key";
    String notFoundKey = "notFound";
    assertNull(MessageUtil.getMessage(null, null, (Object[]) null));
    assertNull(MessageUtil.getMessage(bundle, null, (Object[]) null));
    assertSame(key, MessageUtil.getMessage(null, key, (Object[]) null));
    assertSame(notFoundKey, MessageUtil.getMessage(bundle, notFoundKey, (Object[]) null));
    assertEquals("message aa, {1}, {2}, {3}, {4}", MessageUtil.getMessage(bundle, key, "aa"));
    assertEquals("message aa, bb, {2}, {3}, {4}", MessageUtil.getMessage(bundle, key, "aa", "bb"));
    assertEquals("message aa, bb, cc, {3}, {4}", MessageUtil.getMessage(bundle, key, "aa", "bb", "cc"));
    assertEquals("message aa, bb, cc, dd, {4}", MessageUtil.getMessage(bundle, key, "aa", "bb", "cc", "dd"));
    assertEquals("message aa, bb, cc, dd, ee", MessageUtil.getMessage(bundle, key, "aa", "bb", "cc", "dd", "ee"));
}