import pytest

pytest_plugins = 'setuptools.tests.fixtures'

def pytest_addoption(parser):
      parser.addoption("--package_name", action="append", default=[],
                       help="list of package_name to pass to test functions")


pytest_plugins = 'setuptools.tests.fixtures'

def pytest_addoption(parser):
    parser.addoption(
        "--package_name", action="append", default=[],
        help="list of package_name to pass to test functions",
    )

Clean up conftest.py