@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        sb.append("isSuccess:").append(isSuccess);
        if (StringUtils.isNotBlank(message)) {
            sb.append(", msg:").append(message);
        }
        sb.append("]");
        return sb.toString();
    }
@Test
    public void testToStringEmptyMessage() {
        assertEquals("[isSuccess:false]", result.toString());
    }