Adding another failing test for FasterXML#1565.

src/test/java/com/fasterxml/jackson/failing/TestDeserializePolymorphicDefaultImpl1565.java

@@ -0,0 +1,41 @@
+package com.fasterxml.jackson.failing;
+
+import java.io.IOException;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
+import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
+import com.fasterxml.jackson.annotation.JsonTypeInfo.Id;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class TestDeserializePolymorphicDefaultImpl1565 extends BaseMapTest {
+
+    public void testDeserializeWithSameDefaultImplOnBothBaseClasses() throws JsonProcessingException, IOException {
+        try {
+            ObjectMapper om = objectMapper();
+            om.readerFor(Scenario.Sub1.class).readValue("{\"type\":\"sub1\"}");
+            fail("JsonProcessingException was not thrown.");
+        }
+        catch (IllegalArgumentException e) { // should this throw another type of exception?
+        }
+    }
+
+    /**
+     * Multiple levels of inheritance. 2 Base classes 3 Subs. TypeInfo on both higher and lower base class with same defaultImpl.
+     */
+    static class Scenario {
+        @JsonTypeInfo(include=As.PROPERTY, property="type", use=Id.NAME, defaultImpl=Sub3.class)
+        @JsonSubTypes({@Type(name="sub1", value=Sub1.class), @Type(name="sub2", value=Sub2.class), @Type(name="sub3", value=Sub3.class)})
+        static abstract class BaseHigh {}
+        @JsonTypeInfo(include=As.PROPERTY, property="type", use=Id.NAME, defaultImpl=Sub3.class)
+        @JsonSubTypes({@Type(name="sub1", value=Sub1.class), @Type(name="sub2", value=Sub2.class)})
+        static abstract class BaseLow extends BaseHigh {}
+        static class Sub1 extends BaseLow {}
+        static class Sub2 extends BaseLow {}
+        static class Sub3 extends BaseHigh {}
+    }
+
+}