fn update_aspect(&mut self, window: &Window) -> Option<(f32, f32)> {
        let window_size = window.inner_size();

    fn update_aspect(&mut self, window_size: PhysicalSize<u32>) -> Option<(f32, f32)> {

    use winit::dpi::PhysicalSize;

        );
    }
    #[test]
    fn camera_updates_aspect_properly() {
        let mut camera = Camera {
            width: 400.0,
            height: 400.0,
            ..Default::default()
        };
        // The ratio of screen to camera is about the same (is the same in this case)
        assert_eq!(
            camera.update_aspect(PhysicalSize::new(400, 400)),
            Some((1.0, 1.0))

        // we dont update it if we don't have to.
        assert_eq!(camera.update_aspect(PhysicalSize::new(400, 400)), None);
        // window is too wide, scale down width
        assert_eq!(
            camera.update_aspect(PhysicalSize::new(400, 200)),
            Some((0.5, 1.0))
        );
        // window is too tall, scale down height
        assert_eq!(
            camera.update_aspect(PhysicalSize::new(200, 400)),
            Some((1.0, 0.5))
        )

        if let Some((w, h)) = camera.update_aspect(window) {

        if let Some((w, h)) = camera.update_aspect(window.inner_size()) {