the ctypes tests unconditionally import macholib.dyld, which is not available in an installed testsuite on other platforms. So either don't install this test, or only run the import and test when on MacOS?
Ahh. Not quite, though; that change just changed the way unittest reports the results on non-Mac platforms. The problem is actually here: https://hg.python.org/cpython/file/default/Lib/ctypes/test/test_macholib.py#l34 We need a patch to try that import instead of doing it unconditionally, and adjust the existing skip decorator to check whether the import succeeded.
@Zachary - while that is doable, ctypes.macholib.dyld seems to be available in the dev version of 3.5. >>> import ctypes.macholib.dyld >>> ctypes.macholib.dyld.__file__ '/home/morkov/dev/cpython/Lib/ctypes/macholib/dyld.py' >>> from ctypes.macholib.dyld import dyld_find >>> dyld_find <function dyld_find at 0x7fc36c558560> The test itself is skipped correctly if I run on Linux. /home/morkov/dev/cpython/python ./Lib/ctypes/test/test_macholib.py s ---------------------------------------------------------------------- Ran 1 test in 0.001s OK (skipped=1)
