Running setup.py test with swig-generated bindings depends on some magic? (Cannot find the binary module)

Matěj Cepl <[email protected]> Fri, 06 Nov 2020 23:24:39 +0100
Newsgroups	gmane.comp.programming.swig
Organization	<><
Message-ID	<[email protected]>
Hi,

I am the maintainer of M2Crypto, which is a Python bindings for
OpenSSL using swig for generating its C module (the official
website is https://gitlab.com/m2crypto/m2crypto).

We have been using `python setup.py test` command to run the 
unittest-based testsuite, but that command is going to be 
deprecated (https://github.com/pypa/setuptools/issues/931) so 
I am trying to find a way how to run these tests either with 
pytest or with the plain `python -munittest discover -v`.

Unfortunately, when I try that my tests (perfectly working with 
`python setup.py test`, of course) tend to fail with something
like:

    =============================================================
    ERROR: test_aes (unittest.loader._FailedTest)
    ----------------------------------------------------------------------
    ImportError: Failed to import test module: test_aes
    Traceback (most recent call last):
      File "/usr/lib64/python3.8/unittest/loader.py", line 436, in _find_test_path
        module = self._get_module_from_name(name)
      File "/usr/lib64/python3.8/unittest/loader.py", line 377, in _get_module_from_name
        __import__(name)
      File "/home/abuild/rpmbuild/BUILD/M2Crypto-0.36.0/tests/test_aes.py", line 9, in <module>
        from M2Crypto import m2
      File "/home/abuild/rpmbuild/BUILD/M2Crypto-0.36.0/M2Crypto/__init__.py", line 30, in <module>
        from M2Crypto import (ASN1, AuthCookie, BIO, BN, DH, DSA, EVP, Engine, Err,
      File "/home/abuild/rpmbuild/BUILD/M2Crypto-0.36.0/M2Crypto/ASN1.py", line 15, in <module>
        from M2Crypto import BIO, m2, py27plus, six
      File "/home/abuild/rpmbuild/BUILD/M2Crypto-0.36.0/M2Crypto/BIO.py", line 9, in <module>
        from M2Crypto import m2, py27plus, six
      File "/home/abuild/rpmbuild/BUILD/M2Crypto-0.36.0/M2Crypto/m2.py", line 30, in <module>
        from M2Crypto.m2crypto import *
      File "/home/abuild/rpmbuild/BUILD/M2Crypto-0.36.0/M2Crypto/m2crypto.py", line 13, in <module>
        from ._m2crypto import *
    ModuleNotFoundError: No module named 'M2Crypto._m2crypto'

M2Crypto.m2crypto Python module is generated by swig, but I just 
cannot persuade either of these test runners to find 
_m2crypto.cpython-38-x86_64-linux-gnu.so even when it is copied 
directly into M2Crypto directory (of course, my efforts to set 
PYTHONPATH to build/lib.linux-x86_64-3.8/M2Crypto/ were useless 
as well; I tried LD_LIBRARY_PATH as well).

Is there some environmental variable I need to set or what? How 
is this binary module supposed to be found?

Thank you for any suggestions,

Matěj

-- 
https://matej.ceplovi.cz/blog/, Jabber: [email protected]
GPG Finger: 3C76 A027 CA45 AD70 98B5  BC1D 7920 5802 880B C9D8
 
I would like to die sleeping, like my father — rather than
screaming and helpless, like his passengers.

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