### Question:
SellerServiceImpl implements SellerService { @Override public SellerInfo findSellerInfoByOpenid(String openid) { return repository.findByOpenid(openid); }  @Override SellerInfo findSellerInfoByOpenid(String openid);  }### Answer:
@Test public void findSellerInfoByOpenid() throws Exception { SellerInfo result = sellerService.findSellerInfoByOpenid(openid); Assert.assertEquals(openid, result.getOpenid()); }