Info text for intentional errors Closes #416 (#422)

* info before error
* core.logging usage

tests/test_elecpriceakkudoktor.py

@@ -7,6 +7,7 @@ import pytest
 import requests
 
 from akkudoktoreos.core.ems import get_ems
+from akkudoktoreos.core.logging import get_logger
 from akkudoktoreos.prediction.elecpriceakkudoktor import (
     AkkudoktorElecPrice,
     AkkudoktorElecPriceValue,
@@ -21,6 +22,8 @@ FILE_TESTDATA_ELECPRICEAKKUDOKTOR_1_JSON = DIR_TESTDATA.joinpath(
     "elecpriceforecast_akkudoktor_1.json"
 )
 
+logger = get_logger(__name__)
+
 
 @pytest.fixture
 def provider(monkeypatch, config_eos):
@@ -145,6 +148,7 @@ def test_update_data_with_incomplete_forecast(mock_get, provider):
     mock_response.status_code = 200
     mock_response.content = json.dumps(incomplete_data)
     mock_get.return_value = mock_response
+    logger.info("The following errors are intentional and part of the test.")
     with pytest.raises(ValueError):
         provider._update_data(force_update=True)