TST: added download simulation test

hnn_core/tests/test_gui.py

@@ -563,3 +563,41 @@ def add_child_decorated(self, to_add):
     # Check if the widgets are relinked, the selected index should be synced
     gui.tab_group_1.selected_index = 0
     assert gui.tab_group_2.selected_index == 0
+
+
+def test_gui_download_simulation():
+    """Test the GUI download simulation pipeline."""
+    gui = HNNGUI()
+    _ = gui.compose()
+    gui.params['N_pyr_x'] = 3
+    gui.params['N_pyr_y'] = 3
+
+    # Run a simulation with 3 trials
+    gui.widget_dt.value = 0.85
+    gui.widget_ntrials.value = 3
+
+    # set synch inputs to first driver in simulation
+    sim_name = "sim1"
+    gui.widget_simulation_name.value = sim_name
+
+    # Run simulation
+    gui.run_button.click()
+    serialized_simulation_data, file_extension = (
+        gui.viz_manager.serialize_simulation(sim_name))
+    # result is a zip file
+    assert file_extension == ".zip"
+
+    # Run a simulation with 1 trials
+    gui.widget_dt.value = 0.85
+    gui.widget_ntrials.value = 1
+
+    # set synch inputs to first driver in simulation
+    sim_name2 = "sim2"
+    gui.widget_simulation_name.value = sim_name2
+
+    # Run simulation
+    gui.run_button.click()
+    serialized_simulation_data, file_extension = (
+        gui.viz_manager.serialize_simulation(sim_name2))
+    # result is a single csv file
+    assert file_extension == ".csv"