Test which relies on XML file fails

[nesnoj]

Description of the issue

(At least) the tests which rely on XML file fail. This is probably caused by the partial XML file download which only contains some technologies. However, test_read_xml_file() tries to read "EinheitenKernkraft" (develop) or "EinheitenStromVerbraucher" (622-deprecate-api-download)

Steps to Reproduce

1. Delete the DB and XML files
2. Run pytest -> 29 passed, 5 skipped
3. Run pytest again -> test_read_xml_file() fails:

Message from 622-deprecate-api-download:

zipped_xml_file_path = '/SOME/PATH/.open-MaStR/data/xml_download/Gesamtdatenexport_20251208.zip'                                                                                                                  
                                                                                                                                                                                                                                             
    @pytest.mark.skipif(                                                                                                                                                                                                                     
        not _xml_file_exists, reason="The zipped xml file could not be found."                                                                                                                                                               
    )                                                                                                                                                                                                                                        
    def test_read_xml_file(zipped_xml_file_path):                                                                                                                                                                                            
        file_name = "EinheitenStromVerbraucher"                                                                                                                                                                                              
        with ZipFile(zipped_xml_file_path, "r") as f:                                                                                                                                                                                        
>           df = read_xml_file(f, f"{file_name}.xml")                                                                                                                                                                                        
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Ideas of solution

I propose to

• replace this skipping by a clear dependency like here
• change the xml name to a file which is downloaded in the dependency, e.g. "EinheitenWind.xml" OR add the files to the download.

[FlorianK13]

I think in #670 we need to rework the testing strategy. There we should create one test database with partial download and then run our tests on this database - maybe with EinheitenWind or maybe even with a smaller table.