max_instance_count is keyword parameter.

master/tests/__init__.py

@@ -21,7 +21,7 @@ class SlapOSCloud(SavedTestSuite, ProjectTestSuite):
   _saved_test_id = 'Products.SlapOS.tests.testSlapOSMixin.testSlapOSMixin'
   _bt_list = slapos_bt_list
 
-  def __init__(self, node_quantity, *args, **kw):
+  def __init__(self, max_instance_count=1, *args, **kw):
     # hardcode number of node, to prevent concurrency issue on certificate
     # authority file system storage
-    return SavedTestSuite.__init__(self, 1, *args, **kw)
+    super(SlapOSCloud, self).__init__(max_instance_count=1, *args, **kw)