Add extra command line parameters to Pytest - as a fixture

• conftest

• We can also create a fixture that will read the parameter

import pytest

def pytest_addoption(parser):
    parser.addoption("--demo")

@pytest.fixture
def mydemo(request):
    return request.config.getoption("--demo")

def test_me(mydemo):
    print(mydemo)

pytest -s
test_one.py None

pytest -s --demo Hello
test_one.py Hello