Add failing test for #1231

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/ser/TestJsonSerializeAs.java

@@ -73,7 +73,12 @@ public Bean1178Wrapper(int count) {
             }
         }
     }
-    
+
+    static class Bean1178Holder {
+        @JsonSerialize(as=Bean1178Abstract.class)
+        public Bean1178Base value = new Bean1178Impl();
+    }
+
     /*
     /**********************************************************
     /* Test methods
@@ -107,4 +112,10 @@ public void testSpecializedContentAs() throws IOException {
         assertEquals(aposToQuotes("{'values':[{'a':1,'b':2}]}"),
                 WRITER.writeValueAsString(new Bean1178Wrapper(1)));
     }
+
+    // for [databind#1231] (and continuation of [databind#1178])
+    public void testSpecializedAsIntermediate() throws IOException {
+        assertEquals(aposToQuotes("{'value':{'a':1,'b':2}}"),
+                WRITER.writeValueAsString(new Bean1178Holder()));
+    }
 }