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2013-11-20

Patching

Что такое patching, почему это плохо и как сделать хорошо — статья про Python и тестирование кода:

Python has the power to override any attribute on any module or class, but just because you can doesn't mean you should. This is true in regular code, but just as true of unittests. Many testing libraries (mock, Twisted's trial, py.test) provide facilities for overriding some piece of global state; you can also do so manually. Occasionally these facilities prove invaluable, but often they are used unnecessarily. Better alternatives are available.
...
As I've demonstrated, patching can often be avoided by restructuring code to be more testable. The same Python features that make patching so easy also make avoiding patching just as easy. Given the choice, you should avoid changing global state when testing individual components


Если в двух словах — патчинг это замена какого либо обьекта/глобальной переменной на свою версию. Чтобы обойтись без патчинга, достаточно локализовать неудачный код и слегка отрефакторить его, добавив параметризацию.

Читайте статью, там все на пальцах, с примерами разьяснено.


original post http://vasnake.blogspot.com/2013/11/patching.html

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