### Question:
MchApi extends BaseApi { @Override protected ResourceBundle weixinBundle() { return WEIXIN_BUNDLE; } MchApi(WeixinPayAccount weixinAccount); WeixinSignature getWeixinSignature();  }### Answer:
@Test public void testWeixinBundle() { MchApi mchApi = new MchApi(new WeixinPayAccount(null, null, null)); assertNotNull(mchApi.weixinBundle()); }