content: package com.alibaba.json.bvt.serializer;
  
  import junit.framework.Assert;
  import junit.framework.TestCase;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.JSONException;
  import com.alibaba.fastjson.JSONObject;
  import com.alibaba.fastjson.serializer.JSONSerializer;
  import com.alibaba.fastjson.serializer.SerializeWriter;
  import com.alibaba.fastjson.serializer.SerializerFeature;
  
  public class MapTest extends TestCase {
  
      public void test_no_sort() throws Exception {
          JSONObject obj = new JSONObject(true);
          obj.put("name", "jobs");
          obj.put("id", 33);
          String text = toJSONString(obj);
          Assert.assertEquals("{'name':'jobs','id':33}", text);
      }
      
      public void test_null() throws Exception {
          JSONObject obj = new JSONObject(true);
          obj.put("name", null);
          String text = JSON.toJSONString(obj, SerializerFeature.WriteMapNullValue);
          Assert.assertEquals("{\"name\":null}", text);
      }
  
      public static final String toJSONString(Object object) {
          SerializeWriter out = new SerializeWriter();
  
          try {
              JSONSerializer serializer = new JSONSerializer(out);
              serializer.config(SerializerFeature.SortField, false);
              serializer.config(SerializerFeature.UseSingleQuotes, true);
  
              serializer.write(object);
  
              return out.toString();
          } catch (StackOverflowError e) {
              throw new JSONException("maybe circular references", e);
          } finally {
              out.close();
          }
      }
  }
  