[Python] Why does my Python test run fail when invoked via Tox, despite running just fine when...

When I invoke my Python package testing in the usual way, via Tox, it's failing:

$ python -I -m tox run -e py310-lin
py310-lin: install_deps> python -I -m pip install pytest pytest-cov pytest-xdist typing_extensions PyAMI/dist/pyibis_ami-7.2.2-py3-none-any.whl
.pkg: install_requires> python -I -m pip install 'setuptools>=77.0'
.pkg: _optional_hooks> python /home/dbanas/.venv/pybert-dev/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
.pkg: get_requires_for_build_wheel> python /home/dbanas/.venv/pybert-dev/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
.pkg: build_wheel> python /home/dbanas/.venv/pybert-dev/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
py310-lin: install_package_deps> python -I -m pip install kiwisolver 'pyibis-ami>=7.2.2' 'pyside6<6.7' 'pyyaml>=6' 'scikit-rf>=0.29' typing_extensions
py310-lin: install_package> python -I -m pip install --force-reinstall --no-deps /home/dbanas/prj/PyBERT/.tox/.tmp/package/1/pipbert-7.2.2-py3-none-any.whl
py310-lin: commands[0]> python -m pytest --basetemp=/home/dbanas/prj/PyBERT/.tox/py310-lin/tmp -vv --cov=pybert --cov-report=html --cov-report=term-missing tests
py310-lin: exit -6 (8.83 seconds) /home/dbanas/prj/PyBERT> python -m pytest --basetemp=/home/dbanas/prj/PyBERT/.tox/py310-lin/tmp -vv --cov=pybert --cov-report=html --cov-report=term-missing tests pid=1351
py310-lin: FAIL code -6 (38.56=setup[29.73]+cmd[8.83] seconds)
evaluation failed (38.62 seconds)


However, I'm able to run it manually, using the same Tox test environment, just fine:

$ . .tox/py310-lin/bin/activate
(py310-lin)
dbanas@Dell-XPS-15:~/prj/PyBERT
$ python -m pytest --basetemp=/home/dbanas/prj/PyBERT/.tox/py310-lin/tmp -vv --cov=pybert --cov-report=html --cov-report=term-missing tests
=============================================================================== test session starts ================================================================================
platform linux -- Python 3.10.12, pytest-8.3.5, pluggy-1.5.0 -- /home/dbanas/prj/PyBERT/.tox/py310-lin/bin/python
cachedir: .pytest_cache
rootdir: /home/dbanas/prj/PyBERT
configfile: pyproject.toml
plugins: xdist-3.6.1, cov-6.1.1
collected 63 items

tests/test_basic.py::TestBasic::test_status PASSED [ 1%]
tests/test_basic.py::TestBasic::test_perf PASSED [ 3%]
tests/test_basic.py::TestBasic::test_ber PASSED [ 4%]
tests/test_basic.py::TestBasic::test_dly PASSED [ 6%]
tests/test_basic.py::TestBasic::test_isi PASSED [ 7%]
tests/test_basic.py::TestBasic::test_dcd PASSED [ 9%]
tests/test_basic.py::TestBasic::test_pj PASSED [ 11%]
{Many more passed tests omitted.}
=================================================================== 63 passed, 28 warnings in 102.85s (0:01:42) ====================================================================


So, why is this failing under Tox control?

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