/usr/local/lib/python3.11/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1204: in _gcd_import
    ???
<frozen importlib._bootstrap>:1176: in _find_and_load
    ???
<frozen importlib._bootstrap>:1147: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:690: in _load_unlocked
    ???
../venv/lib/python3.11/site-packages/_pytest/assertion/rewrite.py:171: in exec_module
    exec(co, module.__dict__)
tests/frontend/conftest.py:11: in <module>
    from web import PycroftFlask
web/__init__.py:12: in <module>
    from .app import make_app, PycroftFlask
web/app.py:30: in <module>
    from web import api
web/api/__init__.py:4: in <module>
    from . import v0
web/api/v0/__init__.py:25: in <module>
    from pycroft.lib.user import (
pycroft/lib/user/__init__.py:13: in <module>
    from .edit import (
pycroft/lib/user/edit.py:10: in <module>
    from .mail import send_confirmation_email
pycroft/lib/user/mail.py:8: in <module>
    from pycroft.lib.mail import (
pycroft/lib/mail.py:23: in <module>
    mail_reply_to = os.environ["PYCROFT_MAIL_REPLY_TO"]
<frozen os>:679: in __getitem__
    ???
E   KeyError: 'PYCROFT_MAIL_REPLY_TO'