from secretsanta.domain import Group
from tests.unit.conftest import GroupFactory


def test_pair(group):
    group.pairs = Group.pair(group.participants)

    assert len(group.pairs) == len(
        group.participants
    ), "Number of pairs does not match participants"

    for k, v in group.pairs.items():
        assert k != v, "Self-pairings are not allowed"