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Draft: pp_new_printer_dialog and pp_ppd_selection_dialog tests

Brandon Nielsen requested to merge nielsenb-jf/gnome-control-center:printer-dialog-tests into main

pp_new_printer_dialog and pp_ppd_selection_dialog tests lack smoke tests to verify public API behavior.

For pp_ppd_selection_dialog, test_empty_ui makes sure the "Loading drivers database..." label is shown when no PPDList is provided. test_load_complete ensures the label is cleared when an empty PPDList is provided. test_manufacturer_list_display makes sure the PPDList correctly displays manufacturers. test_model_list_display ensures the displayed models update correctly when a manufacturer is selected. These together effectively exercise pp_ppd_selection_dialog_set_ppd_list.

test_get_ppd_name forces a selection and verifies pp_ppd_selection_dialog_get_ppd_name, test_get_ppd_display_name does the same for pp_ppd_selection_dialog_get_ppd_display_name.

For pp_new_printer_dialog, test_get_new_printer builds a completely new list store to avoid depending on CUPS behaviors. This store is swapped in, a selection is forced, and basic functioning of pp_new_printer_dialog_get_new_printer is checked.

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