content: package com.alibaba.fastjson2.features;
  
  import com.alibaba.fastjson2.JSON;
  import com.alibaba.fastjson2.JSONB;
  import com.alibaba.fastjson2.JSONWriter;
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  public class ReferenceDetectTest {
      @Test
      public void test() {
          Bean bean = new Bean();
  
          StackTraceElement e1 = new StackTraceElement(
                  "d1",
                  "m1",
                  "f1",
                  101
          );
          StackTraceElement e2 = new StackTraceElement(
                  "d2",
                  "m2",
                  "f2",
                  102
          );
          bean.stackTrace = new StackTraceElement[]{
                  e1,
                  e2,
                  e1,
                  e2
          };
  
          String str = JSON.toJSONString(bean, JSONWriter.Feature.ReferenceDetection);
          Bean bean1 = JSON.parseObject(str, Bean.class);
          assertArrayEquals(bean.stackTrace, bean1.stackTrace);
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.ReferenceDetection);
          Bean bean2 = JSONB.parseObject(jsonbBytes, Bean.class);
          assertArrayEquals(bean.stackTrace, bean2.stackTrace);
      }
  
      public static class Bean {
          public StackTraceElement[] stackTrace;
      }
  
      @Test
      public void test1() {
          Bean1 bean = new Bean1();
  
          StackTraceElement e1 = new StackTraceElement(
                  "d1",
                  "m1",
                  "f1",
                  101
          );
          StackTraceElement e2 = new StackTraceElement(
                  "d2",
                  "m2",
                  "f2",
                  102
          );
          bean.stackTrace = new StackTraceElement[]{
                  e1,
                  e2,
                  e1,
                  e2
          };
  
          String str = JSON.toJSONString(bean, JSONWriter.Feature.ReferenceDetection);
          Bean1 bean1 = JSON.parseObject(str, Bean1.class);
          assertArrayEquals(bean.stackTrace, bean1.stackTrace);
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.ReferenceDetection);
          Bean1 bean2 = JSONB.parseObject(jsonbBytes, Bean1.class);
          assertArrayEquals(bean.stackTrace, bean2.stackTrace);
      }
  
      public static class Bean1 {
          private StackTraceElement[] stackTrace;
  
          public StackTraceElement[] getStackTrace() {
              return stackTrace;
          }
  
          public void setStackTrace(StackTraceElement[] stackTrace) {
              this.stackTrace = stackTrace;
          }
      }
  
      @Test
      public void test2() {
          Bean2 bean = new Bean2();
  
          StackTraceElement e1 = new StackTraceElement(
                  "d1",
                  "m1",
                  "f1",
                  101
          );
          StackTraceElement e2 = new StackTraceElement(
                  "d2",
                  "m2",
                  "f2",
                  102
          );
          bean.stackTrace = Arrays.asList(
                  new StackTraceElement[]{
                          e1,
                          e2,
                          e1,
                          e2
                  }
          );
  
          String str = JSON.toJSONString(bean, JSONWriter.Feature.ReferenceDetection);
          Bean2 bean1 = JSON.parseObject(str, Bean2.class);
          assertEquals(bean.stackTrace, bean1.stackTrace);
          assertFalse(str.contains("$ref"));
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.ReferenceDetection);
          Bean2 bean2 = JSONB.parseObject(jsonbBytes, Bean2.class);
          assertEquals(bean.stackTrace, bean2.stackTrace);
      }
  
      public static class Bean2 {
          public List<StackTraceElement> stackTrace;
      }
  
      @Test
      public void test3() {
          Bean3 bean = new Bean3();
  
          StackTraceElement e1 = new StackTraceElement(
                  "d1",
                  "m1",
                  "f1",
                  101
          );
          StackTraceElement e2 = new StackTraceElement(
                  "d2",
                  "m2",
                  "f2",
                  102
          );
          bean.stackTrace = Arrays.asList(
                  new StackTraceElement[]{
                          e1,
                          e2,
                          e1,
                          e2
                  }
          );
  
          String str = JSON.toJSONString(bean, JSONWriter.Feature.ReferenceDetection);
          Bean3 bean1 = JSON.parseObject(str, Bean3.class);
          assertEquals(bean.stackTrace, bean1.stackTrace);
          assertFalse(str.contains("$ref"));
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.ReferenceDetection);
          Bean3 bean2 = JSONB.parseObject(jsonbBytes, Bean3.class);
          assertEquals(bean.stackTrace, bean2.stackTrace);
      }
  
      public static class Bean3 {
          private List<StackTraceElement> stackTrace;
  
          public List<StackTraceElement> getStackTrace() {
              return stackTrace;
          }
  
          public void setStackTrace(List<StackTraceElement> stackTrace) {
              this.stackTrace = stackTrace;
          }
      }
  }
  