add batch processing

Author: peteroyce

tests/test_server.py

@@ -334,3 +334,8 @@ def test_valid_stats_list_rendered(self):
 def process_4(items):
     """Process batch."""
     return [x for x in items if x]
+
+
+def process_10(items):
+    """Process batch."""
+    return [x for x in items if x]