Fix test_os from breakage due to dict views.
diff --git a/Lib/test/mapping_tests.py b/Lib/test/mapping_tests.py
index 09e9dcb..77d66b2 100644
--- a/Lib/test/mapping_tests.py
+++ b/Lib/test/mapping_tests.py
@@ -101,7 +101,7 @@
         #update
         p.update(self.reference)
         self.assertEqual(dict(p), self.reference)
-        items = p.items()
+        items = list(p.items())
         p = self._empty_mapping()
         p.update(items)
         self.assertEqual(dict(p), self.reference)