diff --git a/tests/testutil.py b/tests/testutil.py
index 648e5ec17845e471509970105d8d81902f30cc5f..8dd7e1b8687d07cffc866d428d2a13e94ccb7830 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -43,6 +43,12 @@ def check_post_meta(txn, *expected_meta, default=None):
             }
             assert actual == expected
 
+def combine_values(*value_seqs):
+    return itertools.islice(
+        zip(*(itertools.cycle(seq) for seq in value_seqs)),
+        max(len(seq) for seq in value_seqs),
+    )
+
 def parse_date(s, fmt='%Y-%m-%d'):
     return datetime.datetime.strptime(s, fmt).date()