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3 changes: 2 additions & 1 deletion Lib/test/test_collections.py
Original file line number Diff line number Diff line change
Expand Up @@ -253,8 +253,9 @@ def test_union_operators(self):
# testing behavior between chainmap and iterable key-value pairs
with self.assertRaises(TypeError):
cm3 | pairs
tmp = cm3.copy()
cm3 |= pairs
self.assertEqual(cm3.maps, [cm3.maps[0] | dict(pairs), *cm3.maps[1:]])
self.assertEqual(cm3.maps, [tmp.maps[0] | dict(pairs), *tmp.maps[1:]])

# testing proper return types for ChainMap and it's subclasses
class Subclass(ChainMap):
Expand Down