Failing GUI tests in GitHub Actions

[a-niem]

Description
During automated testing of RodTracker the tests for user interactions with the GUI/whole program fail.
This was not observed when testing locally. So far I was also unable to reproduce it.

List of failed tests:

FAILED tests/test_userinteraction/test_usecases.py::test_typical - AssertionError
FAILED tests/test_userinteraction/test_usecases.py::test_open_rod_after_changes - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_usecases.py::test_undo_after_save - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_usecases.py::test_save_on_unloaded_img - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_position_operations[create rod] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_position_operations[delete rod] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_position_operations[change position] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_number_changing[switch number-abort] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_number_changing[switch number-all] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_number_changing[switch number-one cam] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_number_changing[switch number-one frame] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_number_changing[switch number-this frame/cam] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_length_adjustment[Lengthen-single] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_length_adjustment[Shorten-single] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_length_adjustment[Lengthen-all] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_length_adjustment[Shorten-all] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_display_operations[switch color] - TypeError: 'NoneType' object is not subscriptable
FAILED tests/test_userinteraction/test_useractions.py::test_amendment_operations[undo] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendment_operations[redo] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-CreateRod(25)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-DeleteRod(12)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-ChangeRodPosition(12)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-SwitchRodNumber(12->7)1] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-SwitchRodNumber(12->7)2] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-SwitchRodNumber(12->7)3] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[undo-SwitchRodNumber(12->7)4] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-CreateRod(25)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-DeleteRod(12)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-ChangeRodPosition(12)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-SwitchRodNumber(12->7)1] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-SwitchRodNumber(12->7)2] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-SwitchRodNumber(12->7)3] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_amendmendable_operations[redo-SwitchRodNumber(12->7)4] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-CreateRod(25)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-DeleteRod(12)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-ChangeRodPosition(12)] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-SwitchRodNumber(12->7)0] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-SwitchRodNumber(12->7)1] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-SwitchRodNumber(12->7)2] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-SwitchRodNumber(12->7)3] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-SwitchRodNumber(12->7)4] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-LengthAdjustment(12)0] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-LengthAdjustment(12)1] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-LengthAdjustment(12)2] - TypeError: 'NoneType' object is not iterable
FAILED tests/test_userinteraction/test_useractions.py::test_savable_operations[save-LengthAdjustment(12)3] - TypeError: 'NoneType' object is not iterable

Logs
There appear to be at least 2 failure modes:

1.  tests/test_userinteraction/test_useractions.py:325: 
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    
    self = <gui_actions.LengthAdjustment object at 0x7f702c8f4700>
    main_window = <RodTracker.ui.mainwindow.RodTrackWindow object at 0x7f702c4a4670>
    qtbot = <pytestqt.qtbot.QtBot object at 0x7f702c3f71c0>
    monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x7f6f3bfd6e20>
    tmp_path = PosixPath('/tmp/pytest-of-runner/pytest-0/test_savable_operations_save_L3')
    
        def run(
            self,
            main_window: RodTrackWindow,
            qtbot: QtBot,
            monkeypatch: MonkeyPatch = None,
            tmp_path: pathlib.Path = None,
        ) -> RodTrackWindow:
            if self.assertions:
                state = aa.pre_length_adjustment(main_window)
            if self.rod is not None:
                cam_idx = main_window.ui.camera_tabs.currentIndex()
                cam = main_window.cameras[cam_idx]
                rods = cam.rods
    >           for rod in rods:
    E           TypeError: 'NoneType' object is not iterable
    
    tests/gui_actions.py:537: TypeError
    ------------------------------ Captured log setup ------------------------------
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:63 /home/runner/.local/share/RodTracker/Session_ngdlf7lh
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (camera_0) (gp3) 25 image file(s) loaded from: /opt/hostedtoolcache/Python/3.8.18/x64/lib/python3.8/site-packages/RodTracker/resources/example_data/images/gp3
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (camera_1) (gp4) 25 image file(s) loaded from: /opt/hostedtoolcache/Python/3.8.18/x64/lib/python3.8/site-packages/RodTracker/resources/example_data/images/gp4
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (RodData) Loaded rod file(s) from: /opt/hostedtoolcache/Python/3.8.18/x64/lib/python3.8/site-packages/RodTracker/resources/example_data/csv
   

2.   _________________________________ test_typical _________________________________
    
    main_window = <RodTracker.ui.mainwindow.RodTrackWindow object at 0x7f702c9a3ca0>
    qtbot = <pytestqt.qtbot.QtBot object at 0x7f702c4c7fd0>
    monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x7f702c374070>
    tmp_path = PosixPath('/tmp/pytest-of-runner/pytest-0/test_typical0')
    
        @pytest.mark.filterwarnings("ignore:")
        def test_typical(
            main_window: RodTrackWindow,
            qtbot: QtBot,
            monkeypatch: MonkeyPatch,
            tmp_path: pathlib.Path,
        ):
            """Attempt a typical workflow."""
            try:
                scenario = [
                    ga.OpenData(conftest.csv_data),
                    ga.OpenImage(conftest.cam1_img1),
                    ga.SwitchCamera(),
                    ga.OpenImage(conftest.cam2_img1),
                    ga.SwitchRodNumber(12, 7, lg.NumberChangeActions.ALL_ONE_CAM),
                    ga.SwitchCamera(),
                    ga.SwitchRodNumber(7, 12, lg.NumberChangeActions.CURRENT),
                    ga.SwitchFrame(1),
                    ga.SwitchFrame(1),
                    ga.ChangeRodPosition(12),
                    ga.CreateRod(25),
                    ga.SwitchCamera(),
                    ga.LengthAdjustment(QtCore.Qt.Key_T),
                    ga.SwitchColor("blue"),
                    ga.DeleteRod(12),
                    ga.SaveChanges(),
                ]
                for action in scenario:
    >               main_window = action.run(main_window, qtbot, monkeypatch, tmp_path)
    
    tests/test_userinteraction/test_usecases.py:75: 
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    tests/gui_actions.py:272: in run
        aa.post_number_switch(
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    
    main_window = <RodTracker.ui.mainwindow.RodTrackWindow object at 0x7f702c9a3ca0>
    rod_id = 12, new_id = 7, mode = <NumberChangeActions.ALL_ONE_CAM: 2>
    initial_state = {'dataset':             x1        y1        z1  ...  seen_gp4  particle  color
    0    -5.289254  3.563160  4.213875  ......3779839, 86.78520334109191], 'rod2_pos': [40.8029642065812, 23.430269667032004, 47.53805048682671, 29.433259962428203]}
    
        def post_number_switch(
            main_window: RodTrackWindow,
            rod_id: int,
            new_id: int,
            mode: Union[NumberChangeActions, None],
            initial_state: dict,
        ):
            # currently displayed/loaded
            rod1_new_pos = get_rod_position(main_window, rod_id)
            if mode is not None:
                rod2_new_pos = get_rod_position(main_window, new_id)
    >           assert rod1_new_pos == initial_state["rod2_pos"]
    E           AssertionError
    
    tests/action_assertions.py:201: AssertionError
    ------------------------------ Captured log setup ------------------------------
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:63 /home/runner/.local/share/RodTracker/Session_ovx08pse
    ------------------------------ Captured log call -------------------------------
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (RodData) Loaded rod file(s) from: /opt/hostedtoolcache/Python/3.8.18/x64/lib/python3.8/site-packages/RodTracker/resources/example_data/csv
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (camera_0) (gp3) 25 image file(s) loaded from: /opt/hostedtoolcache/Python/3.8.18/x64/lib/python3.8/site-packages/RodTracker/resources/example_data/images/gp3
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (camera_1) (gp4) 25 image file(s) loaded from: /opt/hostedtoolcache/Python/3.8.18/x64/lib/python3.8/site-packages/RodTracker/resources/example_data/images/gp4
    INFO     RodTracker.ui.loggerwidget:loggerwidget.py:139 (gp4, 500, ) Changed rod #12 ---> #7 of color  in frames >= 500 of gp4.