import pytest

from article_data_manager.validation import normalize_article_number


def test_normalize_article_number_trims_but_preserves_leading_zero() -> None:
    assert normalize_article_number(" 000123 ") == "000123"


def test_normalize_article_number_rejects_non_string() -> None:
    with pytest.raises(TypeError):
        normalize_article_number(123)  # type: ignore[arg-type]