diff --git a/util/vm/build.py b/util/vm/build.py
index daebb345637cde8c3a93452066f15d616a08abc2..6f8b521ab1d1f34f6706fc8dc164a9425cb652f6 100755
--- a/util/vm/build.py
+++ b/util/vm/build.py
@@ -484,6 +484,10 @@ def coreTest( vm, prompt=Prompt ):
             log( '* Test', test, 'output:' )
             log( vm.before )
 
+def noneTest( vm ):
+    "This test does nothing"
+    vm.sendline( 'echo' )
+
 def examplesquickTest( vm, prompt=Prompt ):
     "Quick test of mininet examples"
     vm.sendline( 'sudo apt-get install python-pexpect' )