Tests that CSVs are exported, only when desired

tests/test_simulations.py

@@ -41,9 +41,8 @@ def test_heat_demand():
     assert kpis["Year of construction"].unit == None
 
     for step in ["Geometric", "Physics", "Usage"]:
-        for csv in results.get_all_by_extension(".csv"):
-            if step in csv.name:
-                pytest.fail(f"{csv.name} should not have been exported")
+        with pytest.raises(ValueError, match="Workflow didn't seem to have returned any .csv file!"):
+            results.get_unique_by_extension('.csv', step)
 
 
 @pytest.mark.integration
@@ -56,14 +55,14 @@ def test_heat_demand_with_csv():
         csv_export=True,
     )
 
-    output_csvs = [csv.name for csv in results.get_all_by_extension(".csv")]
     for step, suffixes in [
         ("Geometric", ["buildings", "surfaces"]),
         ("Physics", ["buildings", "surfaces"]),
         ("Usage", ["buildings"]),
     ]:
         for suffix in suffixes:
-            assert f"{step}_{TEST_GML.stem}_{suffix}.csv" in output_csvs
+            found_csv = results.get_unique_by_extension('.csv', step, suffix)
+            assert found_csv.stat().st_size > 0
 
 
 @pytest.mark.integration