Add failing test for FasterXML#576

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/dataformat/xml/failing/PolymorphicList576Test.java

@@ -0,0 +1,118 @@
+package com.fasterxml.jackson.dataformat.xml.failing;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.*;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.xml.XmlTestBase;
+import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
+import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
+import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
+
+public class PolymorphicList576Test extends XmlTestBase
+{
+    @JacksonXmlRootElement(localName = "wrapper")
+    static class Wrapper extends Base {
+
+        @JacksonXmlProperty(localName = "item")
+        @JacksonXmlElementWrapper(useWrapping = false)
+        public List<Item> items = new ArrayList<>();
+
+        public Wrapper(List<Item> items) {
+            this.items = items;
+        }
+
+        public Wrapper() {
+        }
+
+        public List<Item> getItems() {
+            return items;
+        }
+
+        public void setItems(List<Item> items) {
+            this.items = items;
+        }
+
+
+
+        @Override
+        public String toString() {
+            return "Wrapper{" +
+                    "items=" + items +
+                    '}';
+        }
+    }
+
+    @JacksonXmlRootElement(localName = "item")
+    @JsonInclude(JsonInclude.Include.NON_NULL)
+    static class Item {
+
+        private String id;
+
+        public Item(String id) {
+            this.id = id;
+        }
+
+        public Item() {
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        public void setId(String id) {
+            this.id = id;
+        }
+
+        @Override
+        public String toString() {
+            return "Item{" +
+                    "id='" + id + '\'' +
+                    '}';
+        }
+    }
+
+    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
+    @JsonSubTypes({
+            @JsonSubTypes.Type(value = Wrapper.class, name = "wrapper")
+    })
+    @JsonInclude(JsonInclude.Include.NON_NULL)
+    static class Base {
+    }
+
+    /*
+    /********************************************************
+    /* Test methods
+    /********************************************************
+     */
+
+    private final ObjectMapper XML_MAPPER = newMapper();
+
+    public void test_3itemsInXml_expect_3itemsInDeserializedObject() throws Exception {
+        String xmlString = 
+                "<?xml version='1.0' encoding='UTF-8'?>\n"
+                +"<wrapper type='wrapper'>\n"
+                +" <item><id>1</id></item>\n"
+                +" <item><id>2</id></item>\n"
+                +" <item><id>3</id></item>\n"
+                +"</wrapper>\n"
+                ;
+        Base base = XML_MAPPER.readValue(xmlString, Base.class);
+        assertEquals(3, ((Wrapper)base).getItems().size());
+    }
+
+    public void test_2itemsInObject_expect_2itemsInObjectAfterRoundTripDeserializationToBaseClass() throws Exception {
+        Wrapper wrapper = new Wrapper();
+        Item item1 = new Item("1");
+        Item item2 = new Item("2");
+        wrapper.setItems(Arrays.asList(item1, item2));
+
+        String writeValueAsString = XML_MAPPER.writeValueAsString(wrapper);
+        Base base = XML_MAPPER.readValue(writeValueAsString, Base.class);
+
+        assertEquals(2, ((Wrapper)base).getItems().size());
+    }
+}