Is it possible to test cffi module with mock?

[Yu Yang]

I want to check if the arguments passed to c functions are correct, so I use mock to patch these c function, but python reports error 

AttributeError: cannot write to function or constant

Any idea to solve this problem? thx

[Armin Rigo]

Hi Yu,

Indeed, the ``lib`` object is mostly read-only. Maybe you need to
replace the ``lib`` object itself with a mock, so that when the code
calls ``lib.yourfunc(42)`` it will actually call a method on your mock
object.


A bientôt,

Armin.