Atomizer tests assert list.sort() == list.sort() (compares None == None)

[wshlavacek]

tests/test_bng_atomizer.py has two assertions of the form list.sort() == list.sort(). list.sort() returns None, so both sides are always None and the assertion passes regardless of the actual file listing.

Locations:

• tests/test_bng_atomizer.py:23 (in test_atomize_flat)
• tests/test_bng_atomizer.py:42 (in test_atomize_atomized)

Fix is assert sorted(file_list) == sorted(to_match). Note that the test output directory tests/test/ is reused across runs, so once the assertion is real, switching to a per-test tmp_path (or cleaning the directory at setup) is also likely needed.

Supersedes #68 (which is reachable by direct URL but does not appear in the repo issues list).