fixed failing tests

Author: Axel Hörteborn

tests/test_j_create_guide_file.py

@@ -8,15 +8,22 @@
 def test_create_guide_file(gdf: GeoDataFarm):
     clean_up()
     gdf.create_guide()
+    # Select the field first so the attribute list is filtered to tables linked
+    # to this field.  Without filtering, stale tables left in the shared
+    # database from earlier runs may land at row 0 with no numeric columns,
+    # making cellWidget(0, 1) return None.
+    idx = gdf.guide.CGF.CBFields.findText('test_field')
+    gdf.guide.CGF.CBFields.setCurrentIndex(idx)
     gdf.guide.possible_attr('plant')
+    # TWColumnNames row 0, column 1 is the QComboBox listing numeric attributes
+    # of the first available plant table.  setCurrentIndex(2) picks the third
+    # attribute alphabetically (index 2) before it is added to the selected list.
     widget = gdf.guide.CGF.TWColumnNames.cellWidget(0, 1)
     widget.setCurrentIndex(2)
-    gdf.guide.add_to_param_list(2, 0)
-    gdf.guide.add_to_param_list(3, 0)
+    gdf.guide.add_to_param_list(2, 0)  # add attribute at combo-index 2, table row 0
+    gdf.guide.add_to_param_list(3, 0)  # add attribute at combo-index 3, table row 0
     gdf.guide.CGF.TWSelected.selectRow(1)
     gdf.guide.remove_from_param_list()
-    idx = gdf.guide.CGF.CBFields.findText('test_field')
-    gdf.guide.CGF.CBFields.setCurrentIndex(idx)
     gdf.guide.update_max_min()
     gdf.guide.set_output_path()
     gdf.guide.create_file()