In Bevy 0.19 version game - I have written below code to process touch controls like drag-n-drop, double tap, etc. I am trying to write unit test for this code but not able to invoke touches via unit test. Some questions I have around this are:

1. What is the preferred way to process touch inputs? There are gestures(https://docs.rs/bevy_input/0.19.0/bevy_input/gestures/index.html), touch inputs and touches (https://docs.rs/bevy/latest/bevy/input/touch/struct.Touches.html). Which one we have to use?

2. Is bevy_input crate part of bevy itself or we are supposed to add it separately? Code which I am trying to test and its corresponding unit test (which is not working) is below:

pub fn touch_control_system(
    mut touch_state: ResMut,
    touches: Res,
    time: Res)
{
let touch_count = touches.iter().count();
    debug!("touch_count = {}", touch_count);
}

#[test]
    fn test_one_finger_drag_moves_map() {
        let mut app = setup_test_app();
       
        // writing message doesn't work I get touch_count = 0
        app.world_mut().write_message(TouchInput {
            phase: bevy::input::touch::TouchPhase::Started,
            position: Vec2::new(0.01, 0.01),
            force: None,
            id: 1,
            window: my_entity_id,
        });

             // trigger doesn't work either, I still get touch_count = 0
     app.world_mut().trigger(Pointer::::new(
             PointerId::Mouse,
             dummy_location(),
             dummy_press(PointerButton::Secondary),
            my_entity_id,
         ));
}