Add a function to convert DM to EUR (#168)

The function is ment to transform the captial dict into a format that
can be added as a kwarg (**norm_capital(capital_dict) to the company
entities.
This PR only contains the function itself.

tests/utils/data_transfer_test.py

@@ -12,7 +12,9 @@ from pytest_mock import MockerFixture
 from sqlalchemy.engine import Engine
 from sqlalchemy.orm import Session
 
+from aki_prj23_transparenzregister.models.company import CapitalTypeEnum, CurrencyEnum
 from aki_prj23_transparenzregister.utils import data_transfer
+from aki_prj23_transparenzregister.utils.data_transfer import norm_capital
 from aki_prj23_transparenzregister.utils.sql import entities
 
 
@@ -1019,7 +1021,35 @@ def test_add_annual_report_financial_key_error(full_db: Session) -> None:
         )
 
 
-@pytest.mark.working_on()
+@pytest.mark.parametrize("capital_type", [_.value for _ in CapitalTypeEnum])
+@pytest.mark.parametrize("currency", ["€", "EUR"])
+def test_norm_capital_eur(currency: str, capital_type: str) -> None:
+    """Tests if eur entries can be converted / normed correctly."""
+    assert norm_capital({"value": 5, "currency": currency, "type": capital_type}) == {
+        "capital_value": 5.0,
+        "capital_currency": CurrencyEnum("EUR"),
+        "capital_type": CapitalTypeEnum(capital_type),
+    }
+
+
+@pytest.mark.parametrize("capital_type", list(CapitalTypeEnum))
+@pytest.mark.parametrize("currency", ["DM", "DEM"])
+def test_norm_capital_dm(currency: str, capital_type: CapitalTypeEnum) -> None:
+    """Tests if dm entries can be converted / normed correctly."""
+    assert norm_capital(
+        capital={"value": 5, "currency": currency, "type": capital_type}
+    ) == {
+        "capital_value": 2.56,
+        "capital_currency": CurrencyEnum("DM"),
+        "capital_type": CapitalTypeEnum(capital_type),
+    }
+
+
+def test_norm_capital_fail() -> None:
+    """Tests if the entry is dropped if it isn't complete."""
+    assert norm_capital({"something": "something"}) == {}  # type: ignore
+
+
 @pytest.mark.parametrize(
     ("zip_code", "results"),
     [