made the api import test nicer

tests/test_sensospot_data.py

@@ -6,5 +6,4 @@ def test_import_api():
     from sensospot_data import main  # noqa: F401
     from sensospot_data import parse_file  # noqa: F401
     from sensospot_data import parse_folder  # noqa: F401
-    import sensospot_data 
-    assert sensospot_data.columns.POS_ID == "Pos.Id"
+    from sensospot_data import columns  # noqa: F401