@@ -0,0 +1,917 @@
+package com.alibaba.json.bvt.issue_3400;%0A%0Aimport com.alibaba.fastjson.JSON;%0Aimport junit.framework.TestCase;%0A%0Apublic class Issue3470 extends TestCase %7B%0A    public void test_for_issue() throws Exception %7B%0A        String str = JSON.toJSONString(new Privacy().setPassword(%22test%22));%0A        assertEquals(%22%7B%5C%22__password%5C%22:%5C%22test%5C%22%7D%22, str);%0A    %7D%0A%0A    public static class Privacy %7B%0A        private String phone; //%E6%89%8B%E6%9C%BA%0A        private String password; //%E7%99%BB%E5%BD%95%E5%AF%86%E7%A0%81%EF%BC%8C%E9%9A%90%E8%97%8F%E5%AD%97%E6%AE%B5%0A%0A        public Privacy() %7B%0A            super();%0A        %7D%0A%0A        public String getPhone() %7B%0A            return phone;%0A        %7D%0A        public Privacy setPhone(String phone) %7B%0A            this.phone = phone;%0A            return this;%0A        %7D%0A%0A        public String get__password() %7B%0A            return password;%0A        %7D%0A        public Privacy setPassword(String password) %7B%0A            this.password = password;%0A            return this;%0A        %7D%0A    %7D%0A%7D%0A

add testcase for #3470