content: package com.alibaba.fastjson2.v1issues.issue_1500;
  
  import com.alibaba.fastjson2.JSON;
  import com.alibaba.fastjson2.JSONWriter;
  import org.junit.jupiter.api.Test;
  
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class Issue1570 {
      @Test
      public void test_for_issue() throws Exception {
          Model model = new Model();
          assertEquals("{}", JSON.toJSONString(model));
          assertEquals("{\"value\":\"\"}", JSON.toJSONString(model, JSONWriter.Feature.NullAsDefaultValue));
      }
  
      @Test
      public void test_for_issue_string() throws Exception {
          ModelString model = new ModelString();
          assertEquals("{}", JSON.toJSONString(model));
          assertEquals("{\"value\":\"\"}", JSON.toJSONString(model, JSONWriter.Feature.WriteNullStringAsEmpty));
      }
  
      @Test
      public void test_for_issue_int() throws Exception {
          ModelInt model = new ModelInt();
          assertEquals("{}", JSON.toJSONString(model));
          assertEquals("{\"value\":0}", JSON.toJSONString(model, JSONWriter.Feature.WriteNullNumberAsZero));
      }
  
      @Test
      public void test_for_issue_long() throws Exception {
          ModelLong model = new ModelLong();
          assertEquals("{}", JSON.toJSONString(model));
          assertEquals("{\"value\":0}", JSON.toJSONString(model, JSONWriter.Feature.WriteNullNumberAsZero));
      }
  
      @Test
      public void test_for_issue_bool() throws Exception {
          ModelBool model = new ModelBool();
          assertEquals("{}", JSON.toJSONString(model));
          assertEquals("{\"value\":false}", JSON.toJSONString(model, JSONWriter.Feature.WriteNullBooleanAsFalse));
      }
  
      @Test
      public void test_for_issue_list() throws Exception {
          ModelList model = new ModelList();
          assertEquals("{}", JSON.toJSONString(model));
          assertEquals("{\"value\":[]}", JSON.toJSONString(model, JSONWriter.Feature.WriteNullListAsEmpty));
      }
  
      public static class Model {
          public String value;
      }
  
      static class ModelString {
          public String value;
      }
  
      public static class ModelInt {
          public Integer value;
      }
  
      public static class ModelLong {
          public Long value;
      }
  
      public static class ModelBool {
          public Boolean value;
      }
  
      public static class ModelList {
          public List value;
      }
  }
  