Initialize Article Data Manager project

tests/unit/test_article_model.py

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+import pytest
+
+from article_data_manager.models import Article
+
+
+def test_article_number_is_string_and_preserves_leading_zero() -> None:
+    article = Article(nr="000123", name="Example")
+
+    assert article.nr == "000123"
+
+
+def test_article_number_rejects_numeric_value() -> None:
+    with pytest.raises(TypeError):
+        Article(nr=123)  # type: ignore[arg-type]

tests/unit/test_article_number.py

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+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]

tests/unit/test_csv_inspection.py

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+from pathlib import Path
+
+from article_data_manager.importers.csv_inspection import inspect_csv
+
+
+def test_inspect_csv_detects_fixture_shape() -> None:
+    result = inspect_csv(Path("tests/fixtures/production-key-data.csv"))
+
+    assert result.delimiter == ","
+    assert result.row_count == 5
+    assert result.columns[:4] == ("SL_COMPANY_NO", "PHG", "PG", "SL_ITEM_NO")
+    assert "ROP_PRODUCT_WIDTH" in result.columns

tests/unit/test_numbers.py

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+import pytest
+
+from article_data_manager.validation.numbers import parse_decimal
+
+
+def test_parse_decimal_accepts_comma_decimal() -> None:
+    assert parse_decimal("6,00") == 6.0
+
+
+def test_parse_decimal_accepts_point_decimal() -> None:
+    assert parse_decimal("1.20") == 1.2
+
+
+def test_parse_decimal_maps_empty_value_to_none() -> None:
+    assert parse_decimal("") is None
+
+
+def test_parse_decimal_rejects_ambiguous_number() -> None:
+    with pytest.raises(ValueError):
+        parse_decimal("1.234,56")