1 files changed, 29 insertions, 0 deletions
diff --git a/Lib/test/test_zipfile/_itertools.py b/Lib/test/test_zipfile/_itertools.py
index 559f3f1..74f01fe 100644
--- a/Lib/test/test_zipfile/_itertools.py
+++ b/Lib/test/test_zipfile/_itertools.py
@@ -1,3 +1,32 @@
+import itertools
+
+
+# from jaraco.itertools 6.3.0
+class Counter:
+    """
+    Wrap an iterable in an object that stores the count of items
+    that pass through it.
+
+    >>> items = Counter(range(20))
+    >>> items.count
+    0
+    >>> values = list(items)
+    >>> items.count
+    20
+    """
+
+    def __init__(self, i):
+        self.count = 0
+        self.iter = zip(itertools.count(1), i)
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        self.count, result = next(self.iter)
+        return result
+
+
 # from more_itertools v8.13.0
 def always_iterable(obj, base_type=(str, bytes)):
     if obj is None: