from fastapi_oidc_op.userid import generate_userid


def test_generate_userid_format() -> None:
    userid = generate_userid()
    # 32-bit proquint format: xxxxx-xxxxx
    parts = userid.split("-")
    assert len(parts) == 2
    for part in parts:
        assert len(part) == 5


def test_generate_userid_uniqueness() -> None:
    ids = {generate_userid() for _ in range(100)}
    assert len(ids) == 100  # All unique


def test_generate_userid_is_lowercase() -> None:
    userid = generate_userid()
    assert userid == userid.lower()