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Showing content from https://mail.python.org/pipermail/python-dev/2012-July/121107.html below:

[Python-Dev] cpython (merge 3.2 -> default): MERGE: Better test for Issue #15402: Add a __sizeof__ method to struct.Struct

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On 23.07.12 22:46, Michael Foord wrote:
>> I am now prepared a set of 14 __sizeof__ patches (should it be one issue or 14 individual issues in bugtracker?), and I feel a great desire not to write tests at all.
>
> Without tests how can you have any confidence the patches are correct (or will continue to be correct)?

Tests may not provide this. If we add a new dynamically allocated data 
or change the size of the old and forgot to reflect this in __sizeof__, 
then non modified tests not notice this. __sizeof__ returns 42. What is 42?

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