[Python-Dev] dependency injection for testing [was Python 3.3 release schedule posted]

[Michael Foord]

On 24/03/2011 02:06, Jesus Cea wrote:
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> On 23/03/11 20:56, Georg Brandl wrote:
>> For 3.3, I'd like to revive the tradition of listing planned large-scale
>> changes in the PEP.
> I want to integrate dependence injection in the stdlib, specially in
> libs creating sockets. This would be an optional feature.
>
> The idea would be, for instance, that smtplib could call an optional
> constructor to create a socket-like object, if some is provided.
>
> That would break the implicit dependency with sockets, reduce
> monkey-patching need, and ease testing the libs.
>

In general I dislike dependency injection if it's only done for 
testability. With monkey patching (if done right) you can safely test 
Python code without messing with your public interfaces just to make 
code testable.

A clean solution that does monkey patching correctly for us, for use 
within our own tests would be a better solution in my opinion.

All the best,

Michael Foord

> I proposed this on the list like a year ago. Somebody else said he was
> planning a PEP... not done yet, I guess.
>
> Digging the archive:
> <http://mail.python.org/pipermail/python-dev/2010-April/099237.html>
>
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