Add failing test for #2759

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/failing/JsonIdentityInfo2759Test.java

@@ -0,0 +1,72 @@
+package com.fasterxml.jackson.failing;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
+import com.fasterxml.jackson.databind.*;
+
+public class JsonIdentityInfo2759Test extends BaseMapTest
+{
+    static class Bee {
+        public Long id;
+
+        @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
+///        @JsonIdentityReference(alwaysAsId = true)
+//        @JsonProperty("hiveId")
+        Hive hive;
+
+        public Bee() { }
+
+        public Bee(Long id, Hive hive) {
+            this.id = id;
+            this.hive = hive;
+        }
+
+        public Hive getHive() {
+            return hive;
+        }
+
+        public void setHive(Hive hive) {
+            this.hive = hive;
+        }
+    }
+
+    static class Hive {
+        public String name;
+        public List<Bee> bees = new ArrayList<>();
+
+        public Long id;
+
+        Hive() { }
+
+        public Hive(Long id, String name) {
+            this.id = id;
+            this.name = name;
+        }
+
+        public void addBee(Bee bee) {
+            bees.add(bee);
+        }
+    }
+
+    public void testObjectId2759() throws Exception
+    {
+        Hive hive = new Hive(100500L, "main hive");
+        hive.addBee(new Bee(1L, hive));
+
+        ObjectMapper mapper = newJsonMapper();
+        final String json = mapper.writerWithDefaultPrettyPrinter()
+                .writeValueAsString(hive);
+
+        try {
+            mapper.readerFor(JsonNode.class)
+                .with(DeserializationFeature.FAIL_ON_READING_DUP_TREE_KEY)
+                .readValue(json);
+        } catch (JsonMappingException e) {
+            fail("Should not have duplicates, but JSON content has: "+json);
+        }
+    }
+}