@@ -0,0 +1,520 @@
+package com.alibaba.json.bvt.issue_3500;%0A%0Aimport com.alibaba.fastjson.JSON;%0Aimport com.alibaba.fastjson.serializer.SerializerFeature;%0Aimport junit.framework.TestCase;%0A%0Aimport java.math.BigDecimal;%0A%0Apublic class Issue3579 extends TestCase %7B%0A    public void test_for_issue() throws Exception %7B%0A        assertEquals(%221%22,%0A                JSON.toJSONString(new BigDecimal(%221%22))%0A        );%0A%0A        assertEquals(%221.%22,%0A                JSON.toJSONString(new BigDecimal(%221%22), SerializerFeature.WriteClassName)%0A        );%0A    %7D%0A%7D%0A

add testcase for #3579