Function zoom_out

src/navigate.rs:989–1013

()

    
    #[test]
    fn zoom_out() -> Result<()> {
        let mathml_str = "<math id='math'><mfrac id='mfrac'>
                <msup id='msup'><mi id='base'>b</mi><mn id='exp'>2</mn></msup>
                <mi id='denom'>d</mi>
            </mfrac></math>";
            init_default_prefs(mathml_str, "Enhanced");
            return MATHML_INSTANCE.with(|package_instance| {
            let package_instance = package_instance.borrow();
            let mathml = get_element(&*package_instance);
            NAVIGATION_STATE.with(|nav_stack| {
                nav_stack.borrow_mut().push(NavigationPosition{
                    current_node: "base".to_string(),
                    current_node_offset: 0
                }, "None")
            });
            test_command("ZoomOut", mathml, "msup");

            let _nav_speech = do_navigate_command_and_param(mathml, NavigationCommand::Zoom, NavigationParam::Previous)?;
            NAVIGATION_STATE.with(|nav_stack| {
                let (id, _) = nav_stack.borrow().get_navigation_mathml_id(mathml);
                assert_eq!(id, "mfrac");
            });
            return Ok( () );
        });
    }
    
    #[test]
    fn zoom_out_all() -> Result<()> {