@@ -0,0 +1,625 @@
+package com.alibaba.json.bvt.bug;%0A%0Aimport java.util.Collections;%0Aimport java.util.Map;%0A%0Aimport org.junit.Assert;%0A%0Aimport com.alibaba.fastjson.JSON;%0Aimport com.alibaba.fastjson.JSONObject;%0A%0Aimport junit.framework.TestCase;%0A%0Apublic class Issue689 extends TestCase %7B%0A    public void test_0() throws Exception %7B%0A        Map%3CString, Object%3E map = Collections.singletonMap(%22value%22, %22A%C2%A0B%22);%0A        String json = JSON.toJSONString(map);%0A        Assert.assertEquals(%22%7B%5C%22value%5C%22:%5C%22A%5C%5Cu00A0B%5C%22%7D%22, json);%0A        %0A        JSONObject obj = JSON.parseObject(json);%0A        Assert.assertEquals(obj.get(%22value%22), map.get(%22value%22));%0A    %7D%0A%7D%0A

add testcase for issue #689