import pytest

from openslides.core.models import Projector
from openslides.utils import utils


def test_to_roman_result():
    assert utils.to_roman(3) == 'III'


def test_to_roman_none():
    assert utils.to_roman(-3) == '-3'


def test_get_model_from_collection_string_known_app():
    projector_model = utils.get_model_from_collection_string('core/projector')
    assert projector_model == Projector


def test_get_model_from_collection_string_unknown_app():
    with pytest.raises(ValueError):
        utils.get_model_from_collection_string('invalid/model')