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-rw-r--r--Lib/test/test_collections.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 56e8120..ee28a6c 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -301,7 +301,7 @@ class TestNamedTuple(unittest.TestCase):
for module in (pickle,):
loads = getattr(module, 'loads')
dumps = getattr(module, 'dumps')
- for protocol in -1, 0, 1, 2:
+ for protocol in range(-1, module.HIGHEST_PROTOCOL + 1):
q = loads(dumps(p, protocol))
self.assertEqual(p, q)
self.assertEqual(p._fields, q._fields)