Scenario tested

tests/
       test.py
pytest.ini
pytest2.ini

The contents of test.py

from pathlib import Path

def test_root(pytestconfig):
    assert Path(pytestconfig.rootpath).resolve().absolute() == Path('.').resolve().absolute()

pytest.ini and pytest2.ini are the same

• When running pytest tests/ the test is passing (correct rootdir is printed): rootdir: D:\pytest, configfile: pytest.ini
• When running pytest tests/ -c pytest2.ini the test is failing (wrong rootdir and config are reported) : rootdir: D:\pytest\tests, configfile: ..\pytest2.ini

Please let me know if I can submit a fix for this :)