[Pyobjc-dev] unittests for C code

[Ronald O. <ous...@ci...>]

Hi,

I just ran into a problem w.r.t. converting some structs to/from 
Objective-C. It turns out that the code in objc_support.m isn't 
entirely correct, especially for structs that are not carefully layed 
out by the programmer.

Specifically:

	struct Foo {
		int i;
		double d;
		short  s[5];
	};

The sizeof(struct Foo) is different from 
objc_sizeof_type(@encode(struct Foo)). The best way to test if this 
code is correct would be to write some unittests in C.

I'm thinking of adding a extension module containing those unittests. 
Every test would be in a function, and would raise AssertionError when 
the tests fails, just like the code in unittest.py. A header-file would 
create some usefull definitions that make it easier to write these 
tests.

The tests I'll add:
- Convert Python to struct, and check the struct value (and likewise 
for other ObjC values)
- Convert struct to Python, and check the Python value ( ,,, )
- Check objc_sizeof_type, objc_alignof_type, ...

Adding these as unittests makes debugging slightly easier, I currently 
get core-dumps in test_methods2 (when I add testcases for the struct 
mentioned above).

Is there pre-existing code for this, or should I just write this from 
scratch. The problem looks easy enough to just write from scratch.

I'd also like opionions regarding delaying the 1.0 release because of 
this problem.

Ronald