fix broken UT

server/src/main/java/com/metamx/druid/http/InfoResource.java

@@ -296,9 +296,10 @@ public class InfoResource
       final List<Rule> rules
   )
   {
-    return Response.status(Response.Status.OK)
-                   .entity(databaseRuleCoordinator.overrideRule(dataSourceName, rules))
-                   .build();
+    if (databaseRuleCoordinator.overrideRule(dataSourceName, rules)) {
+      return Response.status(Response.Status.OK).build();
+    }
+    return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
   }
 
   @GET

server/src/test/java/com/metamx/druid/coordination/ZkCoordinatorTest.java

@@ -133,7 +133,7 @@ public class ZkCoordinatorTest
               @Override
               public String getSubType()
               {
-                return null;
+                return "normal";
               }
             },
             "dummyType"