Fix bug in test_collections.py (#19221)
Test in TestChainMap() line 257 did not properly check union behavior.
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@ -253,8 +253,9 @@ class TestChainMap(unittest.TestCase):
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# testing behavior between chainmap and iterable key-value pairs
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# testing behavior between chainmap and iterable key-value pairs
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with self.assertRaises(TypeError):
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with self.assertRaises(TypeError):
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cm3 | pairs
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cm3 | pairs
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tmp = cm3.copy()
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cm3 |= pairs
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cm3 |= pairs
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self.assertEqual(cm3.maps, [cm3.maps[0] | dict(pairs), *cm3.maps[1:]])
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self.assertEqual(cm3.maps, [tmp.maps[0] | dict(pairs), *tmp.maps[1:]])
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# testing proper return types for ChainMap and it's subclasses
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# testing proper return types for ChainMap and it's subclasses
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class Subclass(ChainMap):
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class Subclass(ChainMap):
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