@Override
    public String sign(String data, String key) {
        if (StringUtils.isNotBlank(key) && StringUtils.isNotBlank(data)) {
            return RamSignAdapter.getRamSign(data, key);
        }
        return data;
    }
@Test
    public void testGetRamSignNull() {
        String data = null;
        String key = "exampleEncryptKey";
        DefaultAuthSigner signer = new DefaultAuthSigner();
        String sign = signer.sign(data, key);
        Assertions.assertNull(sign);
    }