use crate::{    Action, AnyView, AnyWindowHandle, AppCell, AppContext, AsyncAppContext, AvailableSpace,    BackgroundExecutor, BorrowAppContext, Bounds, ClipboardItem, Context, DrawPhase, Drawable,    Element, Empty, Entity, EventEmitter, ForegroundExecutor, Global, InputEvent, Keystroke, Model,    ModelContext, Modifiers, ModifiersChangedEvent, MouseButton, MouseDownEvent, MouseMoveEvent,    MouseUpEvent, Pixels, Platform, Point, Render, Result, Size, Task, TestDispatcher,    TestPlatform, TestScreenCaptureSource, TestWindow, TextSystem, View, ViewContext,    VisualContext, WindowBounds, WindowContext, WindowHandle, WindowOptions,};use anyhow::{anyhow, bail};use futures::{channel::oneshot, Stream, StreamExt};use std::{cell::RefCell, future::Future, ops::Deref, rc::Rc, sync::Arc, time::Duration}; /// A TestAppContext is provided to tests created with `#[gpui::test]`, it provides/// an implementation of `Context` with additional methods that are useful in tests.#[derive(Clone)]pub struct TestAppContext {    #[doc(hidden)]    pub app: Rc<AppCell>,    #[doc(hidden)]    pub background_executor: BackgroundExecutor,    #[doc(hidden)]    pub foreground_executor: ForegroundExecutor,    #[doc(hidden)]    pub dispatcher: TestDispatcher,    test_platform: Rc<TestPlatform>,    text_system: Arc<TextSystem>,    fn_name: Option<&'static str>,    on_quit: Rc<RefCell<Vec<Box<dyn FnOnce() + 'static>>>>,} impl Context for TestAppContext {    type Result<T> = T;     fn new_model<T: 'static>(        &mut self,        build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,    ) -> Self::Result<Model<T>> {        let mut app = self.app.borrow_mut();        app.new_model(build_model)    }     fn reserve_model<T: 'static>(&mut self) -> Self::Result<crate::Reservation<T>> {        let mut app = self.app.borrow_mut();        app.reserve_model()    }     fn insert_model<T: 'static>(        &mut self,        reservation: crate::Reservation<T>,        build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,    ) -> Self::Result<Model<T>> {        let mut app = self.app.borrow_mut();        app.insert_model(reservation, build_model)    }     fn update_model<T: 'static, R>(        &mut self,        handle: &Model<T>,        update: impl FnOnce(&mut T, &mut ModelContext<'_, T>) -> R,    ) -> Self::Result<R> {        let mut app = self.app.borrow_mut();        app.update_model(handle, update)    }     fn read_model<T, R>(        &self,        handle: &Model<T>,        read: impl FnOnce(&T, &AppContext) -> R,    ) -> Self::Result<R>    where        T: 'static,    {        let app = self.app.borrow();        app.read_model(handle, read)    }     fn update_window<T, F>(&mut self, window: AnyWindowHandle, f: F) -> Result<T>    where        F: FnOnce(AnyView, &mut WindowContext<'_>) -> T,    {        let mut lock = self.app.borrow_mut();        lock.update_window(window, f)    }     fn read_window<T, R>(        &self,        window: &WindowHandle<T>,        read: impl FnOnce(View<T>, &AppContext) -> R,    ) -> Result<R>    where        T: 'static,    {        let app = self.app.borrow();        app.read_window(window, read)    }} impl TestAppContext {    /// Creates a new `TestAppContext`. Usually you can rely on `#[gpui::test]` to do this for you.    pub fn new(dispatcher: TestDispatcher, fn_name: Option<&'static str>) -> Self {        let arc_dispatcher = Arc::new(dispatcher.clone());        let background_executor = BackgroundExecutor::new(arc_dispatcher.clone());        let foreground_executor = ForegroundExecutor::new(arc_dispatcher);        let platform = TestPlatform::new(background_executor.clone(), foreground_executor.clone());        let asset_source = Arc::new(());        let http_client = http_client::FakeHttpClient::with_404_response();        let text_system = Arc::new(TextSystem::new(platform.text_system()));         Self {            app: AppContext::new(platform.clone(), asset_source, http_client),            background_executor,            foreground_executor,            dispatcher: dispatcher.clone(),            test_platform: platform,            text_system,            fn_name,            on_quit: Rc::new(RefCell::new(Vec::default())),        }    }     /// The name of the test function that created this `TestAppContext`    pub fn test_function_name(&self) -> Option<&'static str> {        self.fn_name    }     /// Checks whether there have been any new path prompts received by the platform.    pub fn did_prompt_for_new_path(&self) -> bool {        self.test_platform.did_prompt_for_new_path()    }     /// returns a new `TestAppContext` re-using the same executors to interleave tasks.    pub fn new_app(&self) -> TestAppContext {        Self::new(self.dispatcher.clone(), self.fn_name)    }     /// Called by the test helper to end the test.    /// public so the macro can call it.    pub fn quit(&self) {        self.on_quit.borrow_mut().drain(..).for_each(|f| f());        self.app.borrow_mut().shutdown();    }     /// Register cleanup to run when the test ends.    pub fn on_quit(&mut self, f: impl FnOnce() + 'static) {        self.on_quit.borrow_mut().push(Box::new(f));    }     /// Schedules all windows to be redrawn on the next effect cycle.    pub fn refresh(&mut self) -> Result<()> {        let mut app = self.app.borrow_mut();        app.refresh();        Ok(())    }     /// Returns an executor (for running tasks in the background)    pub fn executor(&self) -> BackgroundExecutor {        self.background_executor.clone()    }     /// Returns an executor (for running tasks on the main thread)    pub fn foreground_executor(&self) -> &ForegroundExecutor {        &self.foreground_executor    }     /// Gives you an `&mut AppContext` for the duration of the closure    pub fn update<R>(&self, f: impl FnOnce(&mut AppContext) -> R) -> R {        let mut cx = self.app.borrow_mut();        cx.update(f)    }     /// Gives you an `&AppContext` for the duration of the closure    pub fn read<R>(&self, f: impl FnOnce(&AppContext) -> R) -> R {        let cx = self.app.borrow();        f(&cx)    }     /// Adds a new window. The Window will always be backed by a `TestWindow` which    /// can be retrieved with `self.test_window(handle)`    pub fn add_window<F, V>(&mut self, build_window: F) -> WindowHandle<V>    where        F: FnOnce(&mut ViewContext<V>) -> V,        V: 'static + Render,    {        let mut cx = self.app.borrow_mut();         // Some tests rely on the window size matching the bounds of the test display        let bounds = Bounds::maximized(None, &mut cx);        cx.open_window(            WindowOptions {                window_bounds: Some(WindowBounds::Windowed(bounds)),                ..Default::default()            },            |cx| cx.new_view(build_window),        )        .unwrap()    }     /// Adds a new window with no content.    pub fn add_empty_window(&mut self) -> &mut VisualTestContext {        let mut cx = self.app.borrow_mut();        let bounds = Bounds::maximized(None, &mut cx);        let window = cx            .open_window(                WindowOptions {                    window_bounds: Some(WindowBounds::Windowed(bounds)),                    ..Default::default()                },                |cx| cx.new_view(|_| Empty),            )            .unwrap();        drop(cx);        let cx = VisualTestContext::from_window(*window.deref(), self).as_mut();        cx.run_until_parked();        cx    }     /// Adds a new window, and returns its root view and a `VisualTestContext` which can be used    /// as a `WindowContext` for the rest of the test. Typically you would shadow this context with    /// the returned one. `let (view, cx) = cx.add_window_view(...);`    pub fn add_window_view<F, V>(&mut self, build_root_view: F) -> (View<V>, &mut VisualTestContext)    where        F: FnOnce(&mut ViewContext<V>) -> V,        V: 'static + Render,    {        let mut cx = self.app.borrow_mut();        let bounds = Bounds::maximized(None, &mut cx);        let window = cx            .open_window(                WindowOptions {                    window_bounds: Some(WindowBounds::Windowed(bounds)),                    ..Default::default()                },                |cx| cx.new_view(build_root_view),            )            .unwrap();        drop(cx);        let view = window.root_view(self).unwrap();        let cx = VisualTestContext::from_window(*window.deref(), self).as_mut();        cx.run_until_parked();         // it might be nice to try and cleanup these at the end of each test.        (view, cx)    }     /// returns the TextSystem    pub fn text_system(&self) -> &Arc<TextSystem> {        &self.text_system    }     /// Simulates writing to the platform clipboard    pub fn write_to_clipboard(&self, item: ClipboardItem) {        self.test_platform.write_to_clipboard(item)    }     /// Simulates reading from the platform clipboard.    /// This will return the most recent value from `write_to_clipboard`.    pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {        self.test_platform.read_from_clipboard()    }     /// Simulates choosing a File in the platform's "Open" dialog.    pub fn simulate_new_path_selection(        &self,        select_path: impl FnOnce(&std::path::Path) -> Option<std::path::PathBuf>,    ) {        self.test_platform.simulate_new_path_selection(select_path);    }     /// Simulates clicking a button in an platform-level alert dialog.    pub fn simulate_prompt_answer(&self, button_ix: usize) {        self.test_platform.simulate_prompt_answer(button_ix);    }     /// Returns true if there's an alert dialog open.    pub fn has_pending_prompt(&self) -> bool {        self.test_platform.has_pending_prompt()    }     /// All the urls that have been opened with cx.open_url() during this test.    pub fn opened_url(&self) -> Option<String> {        self.test_platform.opened_url.borrow().clone()    }     /// Simulates the user resizing the window to the new size.    pub fn simulate_window_resize(&self, window_handle: AnyWindowHandle, size: Size<Pixels>) {        self.test_window(window_handle).simulate_resize(size);    }     /// Causes the given sources to be returned if the application queries for screen    /// capture sources.    pub fn set_screen_capture_sources(&self, sources: Vec<TestScreenCaptureSource>) {        self.test_platform.set_screen_capture_sources(sources);    }     /// Returns all windows open in the test.    pub fn windows(&self) -> Vec<AnyWindowHandle> {        self.app.borrow().windows().clone()    }     /// Run the given task on the main thread.    pub fn spawn<Fut, R>(&self, f: impl FnOnce(AsyncAppContext) -> Fut) -> Task<R>    where        Fut: Future<Output = R> + 'static,        R: 'static,    {        self.foreground_executor.spawn(f(self.to_async()))    }     /// true if the given global is defined    pub fn has_global<G: Global>(&self) -> bool {        let app = self.app.borrow();        app.has_global::<G>()    }     /// runs the given closure with a reference to the global    /// panics if `has_global` would return false.    pub fn read_global<G: Global, R>(&self, read: impl FnOnce(&G, &AppContext) -> R) -> R {        let app = self.app.borrow();        read(app.global(), &app)    }     /// runs the given closure with a reference to the global (if set)    pub fn try_read_global<G: Global, R>(        &self,        read: impl FnOnce(&G, &AppContext) -> R,    ) -> Option<R> {        let lock = self.app.borrow();        Some(read(lock.try_global()?, &lock))    }     /// sets the global in this context.    pub fn set_global<G: Global>(&mut self, global: G) {        let mut lock = self.app.borrow_mut();        lock.update(|cx| cx.set_global(global))    }     /// updates the global in this context. (panics if `has_global` would return false)    pub fn update_global<G: Global, R>(        &mut self,        update: impl FnOnce(&mut G, &mut AppContext) -> R,    ) -> R {        let mut lock = self.app.borrow_mut();        lock.update(|cx| cx.update_global(update))    }     /// Returns an `AsyncAppContext` which can be used to run tasks that expect to be on a background    /// thread on the current thread in tests.    pub fn to_async(&self) -> AsyncAppContext {        AsyncAppContext {            app: Rc::downgrade(&self.app),            background_executor: self.background_executor.clone(),            foreground_executor: self.foreground_executor.clone(),        }    }     /// Wait until there are no more pending tasks.    pub fn run_until_parked(&mut self) {        self.background_executor.run_until_parked()    }     /// Simulate dispatching an action to the currently focused node in the window.    pub fn dispatch_action<A>(&mut self, window: AnyWindowHandle, action: A)    where        A: Action,    {        window            .update(self, |_, cx| cx.dispatch_action(action.boxed_clone()))            .unwrap();         self.background_executor.run_until_parked()    }     /// simulate_keystrokes takes a space-separated list of keys to type.    /// cx.simulate_keystrokes("cmd-shift-p b k s p enter")    /// in Zed, this will run backspace on the current editor through the command palette.    /// This will also run the background executor until it's parked.    pub fn simulate_keystrokes(&mut self, window: AnyWindowHandle, keystrokes: &str) {        for keystroke in keystrokes            .split(' ')            .map(Keystroke::parse)            .map(Result::unwrap)        {            self.dispatch_keystroke(window, keystroke);        }         self.background_executor.run_until_parked()    }     /// simulate_input takes a string of text to type.    /// cx.simulate_input("abc")    /// will type abc into your current editor    /// This will also run the background executor until it's parked.    pub fn simulate_input(&mut self, window: AnyWindowHandle, input: &str) {        for keystroke in input.split("").map(Keystroke::parse).map(Result::unwrap) {            self.dispatch_keystroke(window, keystroke);        }         self.background_executor.run_until_parked()    }     /// dispatches a single Keystroke (see also `simulate_keystrokes` and `simulate_input`)    pub fn dispatch_keystroke(&mut self, window: AnyWindowHandle, keystroke: Keystroke) {        self.update_window(window, |_, cx| cx.dispatch_keystroke(keystroke))            .unwrap();    }     /// Returns the `TestWindow` backing the given handle.    pub(crate) fn test_window(&self, window: AnyWindowHandle) -> TestWindow {        self.app            .borrow_mut()            .windows            .get_mut(window.id)            .unwrap()            .as_mut()            .unwrap()            .platform_window            .as_test()            .unwrap()            .clone()    }     /// Returns a stream of notifications whenever the View or Model is updated.    pub fn notifications<T: 'static>(&mut self, entity: &impl Entity<T>) -> impl Stream<Item = ()> {        let (tx, rx) = futures::channel::mpsc::unbounded();        self.update(|cx| {            cx.observe(entity, {                let tx = tx.clone();                move |_, _| {                    let _ = tx.unbounded_send(());                }            })            .detach();            cx.observe_release(entity, move |_, _| tx.close_channel())                .detach()        });        rx    }     /// Returns a stream of events emitted by the given Model.    pub fn events<Evt, T: 'static + EventEmitter<Evt>>(        &mut self,        entity: &Model<T>,    ) -> futures::channel::mpsc::UnboundedReceiver<Evt>    where        Evt: 'static + Clone,    {        let (tx, rx) = futures::channel::mpsc::unbounded();        entity            .update(self, |_, cx: &mut ModelContext<T>| {                cx.subscribe(entity, move |_model, _handle, event, _cx| {                    let _ = tx.unbounded_send(event.clone());                })            })            .detach();        rx    }     /// Runs until the given condition becomes true. (Prefer `run_until_parked` if you    /// don't need to jump in at a specific time).    pub async fn condition<T: 'static>(        &mut self,        model: &Model<T>,        mut predicate: impl FnMut(&mut T, &mut ModelContext<T>) -> bool,    ) {        let timer = self.executor().timer(Duration::from_secs(3));        let mut notifications = self.notifications(model);         use futures::FutureExt as _;        use smol::future::FutureExt as _;         async {            loop {                if model.update(self, &mut predicate) {                    return Ok(());                }                 if notifications.next().await.is_none() {                    bail!("model dropped")                }            }        }        .race(timer.map(|_| Err(anyhow!("condition timed out"))))        .await        .unwrap();    }     /// Set a name for this App.    #[cfg(any(test, feature = "test-support"))]    pub fn set_name(&mut self, name: &'static str) {        self.update(|cx| cx.name = Some(name))    }} impl<T: 'static> Model<T> {    /// Block until the next event is emitted by the model, then return it.    pub fn next_event<Event>(&self, cx: &mut TestAppContext) -> impl Future<Output = Event>    where        Event: Send + Clone + 'static,        T: EventEmitter<Event>,

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