[BUG] tests are failing in devcontainer

[a-v-popov]

Tests are failing in devcontainer

vscode ➜ /workspaces/netlab/tests (dev) $ PYTHONPATH="../" python3 -m pytest --tb=no -k 'xform_ or error_cases'
================================================================================================ test session starts =================================================================================================
platform linux -- Python 3.11.15, pytest-9.0.3, pluggy-1.6.0
rootdir: /workspaces/netlab
collected 5 items / 3 deselected / 2 selected                                                                                                                                                                        

test_transformation.py FF                                                                                                                                                                                      [100%]

============================================================================================== short test summary info ===============================================================================================
FAILED test_transformation.py::test_xform_cases - AssertionError: assert 'nodes:\n  c_...er: libvirt\n' == 'input:\n- to...er: libvirt\n'
FAILED test_transformation.py::test_error_cases - assert ['IncorrectVa...= 65535', ...] == ['IncorrectVa...= 65535', ...]
========================================================================================== 2 failed, 3 deselected in 17.36s ==========================================================================================
vscode ➜ /workspaces/netlab/tests (dev) $ history
    1  pip3 install -r requirements-dev.txt
    2  cd tests/
    3  PYTHONPATH="../" python3 -m pytest --tb=no -k 'xform_ or error_cases'
    4  history
vscode ➜ /workspaces/netlab/tests (dev) $

I also ran tests on pristine Ubuntu 24.04.4 LTS VM in GCP and I think they were working only until I ran netlab install ubuntu containerlab libvirt ansible.

[ipspace]

The expected test results are created through PyYAML package. The Box package uses ruamel.yaml if it's available, and it looks like some package installed in the "netlab install" process has ruamel.yaml as a requirement. If you uninstall Ruamel, the tests should run just fine.

[a-v-popov]

And that is why I reported it against devcontainer.

[ipspace]

OK, here's how things stand:

• I won't make ruamel.yaml a mandatory package.
• There is no easy way to tell Box package not to use ruamel
• It's pretty hard to make ruamel YAML dump behave the same way as PyYAML with a reasonable amount of code.

The easiest fix seems to be a fatal error saying "uninstall ruamel". Would that work?