Untitled-1

async def test_select_platform_type(test_datastore):
    # Test application in a dummy session.
    input = DummyInput()
    output = DummyOutput()
    # output = None

    with create_app_session(output=output, input=input):
        gui = MaintenanceGUI(test_datastore)

        task = asyncio.create_task(gui.app.run_async())

        ready_event = asyncio.Event()
        gui.app.after_render += lambda _: ready_event.set()
        await ready_event.wait()
        ready_event.clear()

        # Type 'PlatformTy' - which filters a dropdown box on every keypress
        for letter in "PlatformTy":
            gui.app.key_processor.feed(KeyPress(letter))
            gui.app.key_processor.process_keys()

            await ready_event.wait()
            ready_event.clear()
        
        # Send Enter to select the 'PlatformTypes' entry
        gui.app.key_processor.feed(KeyPress(Keys.ControlM, "\r"))
        gui.app.key_processor.process_keys()

        await ready_event.wait()
        ready_event.clear()

        assert gui.current_table_object == test_datastore.db_classes.PlatformType

        # Send Enter to say yes
        gui.app.exit()

        # Wait for the application to properly terminate.
        await task