import pytest

from app.domain.reference_normalization import normalize_reference


@pytest.mark.unit
@pytest.mark.parametrize(
    ("raw", "expected"),
    [
        ("a12", "12"),
        ("A12", "A12"),
        ("aA12", "A12"),
        ("a", None),
        ("", None),
        (None, None),
        ("  a12  ", "12"),
        ("12345", "12345"),
        ("aa12", "a12"),
    ],
)
def test_normalize_reference(raw: str | None, expected: str | None) -> None:
    assert normalize_reference(raw) == expected