diff --git a/src/main/java/com/ntlab/irisserver/resources/TestRest.java b/src/main/java/com/ntlab/irisserver/resources/TestRest.java
index 4699fa7..adb807f 100644
--- a/src/main/java/com/ntlab/irisserver/resources/TestRest.java
+++ b/src/main/java/com/ntlab/irisserver/resources/TestRest.java
@@ -73,7 +73,7 @@
                 rch[i] = (char)(random.nextInt(26) + 'a');
             }
             rname = new String(rch);
-            tr.addMember(rname);
+            if(length < 4)tr.addMember(rname);
             dr.addMember(rname);
             gr.addMember(rname);
             List<Member> members = dr.getMembers();