    @Test
    public void getPrepay() throws Exception {

        Assert.assertNotNull(prepayData);
        WechatPrepayResponseDto responseDto =  WechatPrepayService.getPrepay(prepayData, "");
        Assert.assertNotNull(responseDto);
        Assert.assertEquals("SUCCESS", responseDto.getReturn_code());
        Assert.assertNotNull(responseDto.getPrepay_id());
        Assert.assertNotNull(responseDto.getSign());
        Assert.assertNotNull(responseDto.getAmount());
        Assert.assertTrue(responseDto.getAmount() > 0);
        logger.info("prepay response : {}", responseDto);
    }