use warpui::integration::{AssertionCallback, AssertionOutcome, StepData};use warpui::windowing::WindowManager;use warpui::{SingletonEntity, async_assert_eq}; /// Saves the active window id with the given step data key.pub fn save_active_window_id<K>(window_key: K) -> AssertionCallbackwhere    K: Into<String>,{    let window_key = window_key.into();    Box::new(move |app, _| {        let window_id = app.read(|ctx| WindowManager::as_ref(ctx).active_window());        AssertionOutcome::SuccessWithData(StepData::new(            window_key.clone(),            window_id.expect("window id present"),        ))    })} /// Asserts the number of windows that are open.pub fn assert_num_windows_open(num_windows: usize) -> AssertionCallback {    Box::new(move |app, _| async_assert_eq!(app.window_ids().len(), num_windows))}