Options: how to bail if not set?

[WilliamDEdwards]

Scenario

• When calling request.config.getoption
• for an option that was added using parser.addoption
• without default
• and wasn't given when invoking pytest
• pytest doesn't bail, with an "option has no default, but was not specified" error

Instead, the option defaults to None.

Question

How do I work around this natively? Is there a sentinel I can use, like getoption does with Notset?

FWIW: I suppose I could check if any option was specified in a pytest_configure hook, but that's tedious for many projects.

Example

Snippet from conftest.py

def pytest_addoption(parser: Parser) -> None:
    parser.addoption("--test", action="store")

@pytest.fixture
def test(request: pytest.FixtureRequest) -> str:
    return request.config.getoption("--test")

CLI

pytest

(No --test is specified.)

Expected

pytest bails with an "option has no default, but was not specified" error.

Result

The option defaults to None.

[WilliamDEdwards]

I just figured out that pytest uses argparse, which supports required=True.

Sorry for the noise.

[RonnyPfannschmidt]

using required=True breaks --help atm

[RonnyPfannschmidt]

the recommended way currently us to use a pytest_configure hook and raising a usage-error