Add failing test for #2811

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/failing/JsonTypeInfoCustomResolver2811Test.java

@@ -0,0 +1,115 @@
+package com.fasterxml.jackson.failing;
+
+import java.io.IOException;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+
+import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.annotation.JsonTypeIdResolver;
+import com.fasterxml.jackson.databind.jsontype.impl.TypeIdResolverBase;
+
+public class JsonTypeInfoCustomResolver2811Test extends BaseMapTest
+{
+    interface Vehicle {
+    }
+
+    static class Car implements Vehicle {
+        public int wheels;
+        public String color;
+    }
+
+    static class Bicycle implements Vehicle {
+        public int wheels;
+        public String bicycleType;
+    }
+
+    static class Person<T extends Vehicle> {
+        public String name;
+        public VehicleType vehicleType;
+
+        @JsonTypeInfo(use = JsonTypeInfo.Id.CUSTOM, include = JsonTypeInfo.As.EXTERNAL_PROPERTY, property = "vehicleType")
+        @JsonTypeIdResolver(VehicleTypeResolver.class)
+        public T vehicle;
+    }
+
+    public enum VehicleType {
+        CAR(Car.class),
+        BICYCLE(Bicycle.class);
+
+        public final Class<? extends Vehicle> vehicleClass;
+
+        VehicleType(Class<? extends Vehicle> vehicleClass) {
+            this.vehicleClass = vehicleClass;
+        }
+    }
+
+    static class VehicleTypeResolver extends TypeIdResolverBase {
+
+        JavaType superType;
+
+        @Override
+        public void init(JavaType bt) {
+            this.superType = bt;
+        }
+
+        @Override
+        public String idFromValue(Object value) {
+            return null;
+        }
+
+        @Override
+        public String idFromValueAndType(Object value, Class<?> suggestedType) {
+            return null;
+        }
+
+        @Override
+        public JavaType typeFromId(DatabindContext context, String id) throws IOException {
+            try {
+                Class<? extends Vehicle> vehicleClass = VehicleType.valueOf(id).vehicleClass;
+                return context.constructSpecializedType(superType, vehicleClass);
+            } catch (IllegalArgumentException e) {
+                return null;
+            }
+        }
+
+        @Override
+        public JsonTypeInfo.Id getMechanism() {
+            return JsonTypeInfo.Id.NAME;
+        }
+    }
+
+    private final ObjectMapper MAPPER = jsonMapperBuilder()
+            .disable(DeserializationFeature.FAIL_ON_MISSING_EXTERNAL_TYPE_ID_PROPERTY)
+            .disable(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE)
+            .build();
+    
+    // [databind#2811]
+    public void testTypeInfoWithCustomResolver2811NoTypeId() throws Exception
+    {
+        String json = "{ \"name\": \"kamil\", \"vehicle\": {\"wheels\": 4, \"color\": \"red\"}}";
+        Person<?> person = MAPPER.readValue(json, Person.class);
+        assertEquals("kamil", person.name);
+        assertNull(person.vehicleType);
+        assertNull(person.vehicle);        
+    }
+
+    // Passing case for comparison
+    /*
+    public void testTypeInfoWithCustomResolver2811WithTypeId() throws Exception
+    {
+        String json = "{\n" + 
+                "  \"name\": \"kamil\",\n" + 
+                "  \"vehicleType\": \"CAR\",\n" + 
+                "  \"vehicle\": {\n" + 
+                "    \"wheels\": 4,\n" + 
+                "    \"color\": \"red\"\n" + 
+                "  }\n" + 
+                "}"
+                ;
+        Person<?> person = MAPPER.readValue(json, Person.class);
+        assertEquals("kamil", person.name);
+        assertEquals(VehicleType.CAR, person.vehicleType);
+        assertNotNull(person.vehicle);
+    }
+    */
+}