Fix, group members

Change-Id: I71c2dd4b1970b39427beda6465b7a4726b12897b
diff --git a/tests/pillar/system.sls b/tests/pillar/system.sls
index 7f7b087..8d39312 100644
--- a/tests/pillar/system.sls
+++ b/tests/pillar/system.sls
@@ -74,6 +74,7 @@
         enabled: true
         delusers:
           - salt_user1
+          - dontexistatall
       salt-ops:
         enabled: true
         name: salt-ops