From the validator.py, this test_validator.py is run.

I created a new setup.py file to define the installation process for the Osdag package. This file includes a custom install command that aims to run tests using pytest after installation. The setup.py allows for manual triggering of tests through the pip install --editable . command, though automatic test execution during installation is not fully functional due to limitations with the pyproject.toml file.

@pytest.mark.xfail is a pytest marker used to indicate that a particular test is expected to fail.