1#![deny(missing_docs)]
2
3use crate::{
4 div, Action, AnyView, AnyWindowHandle, AppCell, AppContext, AsyncAppContext,
5 BackgroundExecutor, ClipboardItem, Context, Entity, EventEmitter, ForegroundExecutor,
6 IntoElement, Keystroke, Model, ModelContext, Pixels, Platform, Render, Result, Size, Task,
7 TestDispatcher, TestPlatform, TestWindow, TextSystem, View, ViewContext, VisualContext,
8 WindowContext, WindowHandle, WindowOptions,
9};
10use anyhow::{anyhow, bail};
11use futures::{Stream, StreamExt};
12use std::{future::Future, ops::Deref, rc::Rc, sync::Arc, time::Duration};
13
14/// A TestAppContext is provided to tests created with `#[gpui::test]`, it provides
15/// an implementation of `Context` with additional methods that are useful in tests.
16#[derive(Clone)]
17pub struct TestAppContext {
18 #[doc(hidden)]
19 pub app: Rc<AppCell>,
20 #[doc(hidden)]
21 pub background_executor: BackgroundExecutor,
22 #[doc(hidden)]
23 pub foreground_executor: ForegroundExecutor,
24 #[doc(hidden)]
25 pub dispatcher: TestDispatcher,
26 test_platform: Rc<TestPlatform>,
27 text_system: Arc<TextSystem>,
28 fn_name: Option<&'static str>,
29}
30
31impl Context for TestAppContext {
32 type Result<T> = T;
33
34 fn new_model<T: 'static>(
35 &mut self,
36 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
37 ) -> Self::Result<Model<T>>
38 where
39 T: 'static,
40 {
41 let mut app = self.app.borrow_mut();
42 app.new_model(build_model)
43 }
44
45 fn update_model<T: 'static, R>(
46 &mut self,
47 handle: &Model<T>,
48 update: impl FnOnce(&mut T, &mut ModelContext<'_, T>) -> R,
49 ) -> Self::Result<R> {
50 let mut app = self.app.borrow_mut();
51 app.update_model(handle, update)
52 }
53
54 fn update_window<T, F>(&mut self, window: AnyWindowHandle, f: F) -> Result<T>
55 where
56 F: FnOnce(AnyView, &mut WindowContext<'_>) -> T,
57 {
58 let mut lock = self.app.borrow_mut();
59 lock.update_window(window, f)
60 }
61
62 fn read_model<T, R>(
63 &self,
64 handle: &Model<T>,
65 read: impl FnOnce(&T, &AppContext) -> R,
66 ) -> Self::Result<R>
67 where
68 T: 'static,
69 {
70 let app = self.app.borrow();
71 app.read_model(handle, read)
72 }
73
74 fn read_window<T, R>(
75 &self,
76 window: &WindowHandle<T>,
77 read: impl FnOnce(View<T>, &AppContext) -> R,
78 ) -> Result<R>
79 where
80 T: 'static,
81 {
82 let app = self.app.borrow();
83 app.read_window(window, read)
84 }
85}
86
87impl TestAppContext {
88 /// Creates a new `TestAppContext`. Usually you can rely on `#[gpui::test]` to do this for you.
89 pub fn new(dispatcher: TestDispatcher, fn_name: Option<&'static str>) -> Self {
90 let arc_dispatcher = Arc::new(dispatcher.clone());
91 let background_executor = BackgroundExecutor::new(arc_dispatcher.clone());
92 let foreground_executor = ForegroundExecutor::new(arc_dispatcher);
93 let platform = TestPlatform::new(background_executor.clone(), foreground_executor.clone());
94 let asset_source = Arc::new(());
95 let http_client = util::http::FakeHttpClient::with_404_response();
96 let text_system = Arc::new(TextSystem::new(platform.text_system()));
97
98 Self {
99 app: AppContext::new(platform.clone(), asset_source, http_client),
100 background_executor,
101 foreground_executor,
102 dispatcher: dispatcher.clone(),
103 test_platform: platform,
104 text_system,
105 fn_name,
106 }
107 }
108
109 /// The name of the test function that created this `TestAppContext`
110 pub fn test_function_name(&self) -> Option<&'static str> {
111 self.fn_name
112 }
113
114 /// Checks whether there have been any new path prompts received by the platform.
115 pub fn did_prompt_for_new_path(&self) -> bool {
116 self.test_platform.did_prompt_for_new_path()
117 }
118
119 /// returns a new `TestAppContext` re-using the same executors to interleave tasks.
120 pub fn new_app(&self) -> TestAppContext {
121 Self::new(self.dispatcher.clone(), self.fn_name)
122 }
123
124 /// Simulates quitting the app.
125 pub fn quit(&self) {
126 self.app.borrow_mut().shutdown();
127 }
128
129 /// Schedules all windows to be redrawn on the next effect cycle.
130 pub fn refresh(&mut self) -> Result<()> {
131 let mut app = self.app.borrow_mut();
132 app.refresh();
133 Ok(())
134 }
135
136 /// Returns an executor (for running tasks in the background)
137 pub fn executor(&self) -> BackgroundExecutor {
138 self.background_executor.clone()
139 }
140
141 /// Returns an executor (for running tasks on the main thread)
142 pub fn foreground_executor(&self) -> &ForegroundExecutor {
143 &self.foreground_executor
144 }
145
146 /// Gives you an `&mut AppContext` for the duration of the closure
147 pub fn update<R>(&self, f: impl FnOnce(&mut AppContext) -> R) -> R {
148 let mut cx = self.app.borrow_mut();
149 cx.update(f)
150 }
151
152 /// Gives you an `&AppContext` for the duration of the closure
153 pub fn read<R>(&self, f: impl FnOnce(&AppContext) -> R) -> R {
154 let cx = self.app.borrow();
155 f(&*cx)
156 }
157
158 /// Adds a new window. The Window will always be backed by a `TestWindow` which
159 /// can be retrieved with `self.test_window(handle)`
160 pub fn add_window<F, V>(&mut self, build_window: F) -> WindowHandle<V>
161 where
162 F: FnOnce(&mut ViewContext<V>) -> V,
163 V: 'static + Render,
164 {
165 let mut cx = self.app.borrow_mut();
166 cx.open_window(WindowOptions::default(), |cx| cx.new_view(build_window))
167 }
168
169 /// Adds a new window with no content.
170 pub fn add_empty_window(&mut self) -> AnyWindowHandle {
171 let mut cx = self.app.borrow_mut();
172 cx.open_window(WindowOptions::default(), |cx| cx.new_view(|_| EmptyView {}))
173 .any_handle
174 }
175
176 /// Adds a new window, and returns its root view and a `VisualTestContext` which can be used
177 /// as a `WindowContext` for the rest of the test. Typically you would shadow this context with
178 /// the returned one. `let (view, cx) = cx.add_window_view(...);`
179 pub fn add_window_view<F, V>(&mut self, build_window: F) -> (View<V>, &mut VisualTestContext)
180 where
181 F: FnOnce(&mut ViewContext<V>) -> V,
182 V: 'static + Render,
183 {
184 let mut cx = self.app.borrow_mut();
185 let window = cx.open_window(WindowOptions::default(), |cx| cx.new_view(build_window));
186 drop(cx);
187 let view = window.root_view(self).unwrap();
188 let cx = Box::new(VisualTestContext::from_window(*window.deref(), self));
189 cx.run_until_parked();
190 // it might be nice to try and cleanup these at the end of each test.
191 (view, Box::leak(cx))
192 }
193
194 /// returns the TextSystem
195 pub fn text_system(&self) -> &Arc<TextSystem> {
196 &self.text_system
197 }
198
199 /// Simulates writing to the platform clipboard
200 pub fn write_to_clipboard(&self, item: ClipboardItem) {
201 self.test_platform.write_to_clipboard(item)
202 }
203
204 /// Simulates reading from the platform clipboard.
205 /// This will return the most recent value from `write_to_clipboard`.
206 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
207 self.test_platform.read_from_clipboard()
208 }
209
210 /// Simulates choosing a File in the platform's "Open" dialog.
211 pub fn simulate_new_path_selection(
212 &self,
213 select_path: impl FnOnce(&std::path::Path) -> Option<std::path::PathBuf>,
214 ) {
215 self.test_platform.simulate_new_path_selection(select_path);
216 }
217
218 /// Simulates clicking a button in an platform-level alert dialog.
219 pub fn simulate_prompt_answer(&self, button_ix: usize) {
220 self.test_platform.simulate_prompt_answer(button_ix);
221 }
222
223 /// Returns true if there's an alert dialog open.
224 pub fn has_pending_prompt(&self) -> bool {
225 self.test_platform.has_pending_prompt()
226 }
227
228 /// Simulates the user resizing the window to the new size.
229 pub fn simulate_window_resize(&self, window_handle: AnyWindowHandle, size: Size<Pixels>) {
230 self.test_window(window_handle).simulate_resize(size);
231 }
232
233 /// Returns all windows open in the test.
234 pub fn windows(&self) -> Vec<AnyWindowHandle> {
235 self.app.borrow().windows().clone()
236 }
237
238 /// Run the given task on the main thread.
239 pub fn spawn<Fut, R>(&self, f: impl FnOnce(AsyncAppContext) -> Fut) -> Task<R>
240 where
241 Fut: Future<Output = R> + 'static,
242 R: 'static,
243 {
244 self.foreground_executor.spawn(f(self.to_async()))
245 }
246
247 /// true if the given global is defined
248 pub fn has_global<G: 'static>(&self) -> bool {
249 let app = self.app.borrow();
250 app.has_global::<G>()
251 }
252
253 /// runs the given closure with a reference to the global
254 /// panics if `has_global` would return false.
255 pub fn read_global<G: 'static, R>(&self, read: impl FnOnce(&G, &AppContext) -> R) -> R {
256 let app = self.app.borrow();
257 read(app.global(), &app)
258 }
259
260 /// runs the given closure with a reference to the global (if set)
261 pub fn try_read_global<G: 'static, R>(
262 &self,
263 read: impl FnOnce(&G, &AppContext) -> R,
264 ) -> Option<R> {
265 let lock = self.app.borrow();
266 Some(read(lock.try_global()?, &lock))
267 }
268
269 /// sets the global in this context.
270 pub fn set_global<G: 'static>(&mut self, global: G) {
271 let mut lock = self.app.borrow_mut();
272 lock.set_global(global);
273 }
274
275 /// updates the global in this context. (panics if `has_global` would return false)
276 pub fn update_global<G: 'static, R>(
277 &mut self,
278 update: impl FnOnce(&mut G, &mut AppContext) -> R,
279 ) -> R {
280 let mut lock = self.app.borrow_mut();
281 lock.update_global(update)
282 }
283
284 /// Returns an `AsyncAppContext` which can be used to run tasks that expect to be on a background
285 /// thread on the current thread in tests.
286 pub fn to_async(&self) -> AsyncAppContext {
287 AsyncAppContext {
288 app: Rc::downgrade(&self.app),
289 background_executor: self.background_executor.clone(),
290 foreground_executor: self.foreground_executor.clone(),
291 }
292 }
293
294 /// Wait until there are no more pending tasks.
295 pub fn run_until_parked(&mut self) {
296 self.background_executor.run_until_parked()
297 }
298
299 /// Simulate dispatching an action to the currently focused node in the window.
300 pub fn dispatch_action<A>(&mut self, window: AnyWindowHandle, action: A)
301 where
302 A: Action,
303 {
304 window
305 .update(self, |_, cx| cx.dispatch_action(action.boxed_clone()))
306 .unwrap();
307
308 self.background_executor.run_until_parked()
309 }
310
311 /// simulate_keystrokes takes a space-separated list of keys to type.
312 /// cx.simulate_keystrokes("cmd-shift-p b k s p enter")
313 /// in Zed, this will run backspace on the current editor through the command palette.
314 /// This will also run the background executor until it's parked.
315 pub fn simulate_keystrokes(&mut self, window: AnyWindowHandle, keystrokes: &str) {
316 for keystroke in keystrokes
317 .split(" ")
318 .map(Keystroke::parse)
319 .map(Result::unwrap)
320 {
321 self.dispatch_keystroke(window, keystroke.into(), false);
322 }
323
324 self.background_executor.run_until_parked()
325 }
326
327 /// simulate_input takes a string of text to type.
328 /// cx.simulate_input("abc")
329 /// will type abc into your current editor
330 /// This will also run the background executor until it's parked.
331 pub fn simulate_input(&mut self, window: AnyWindowHandle, input: &str) {
332 for keystroke in input.split("").map(Keystroke::parse).map(Result::unwrap) {
333 self.dispatch_keystroke(window, keystroke.into(), false);
334 }
335
336 self.background_executor.run_until_parked()
337 }
338
339 /// dispatches a single Keystroke (see also `simulate_keystrokes` and `simulate_input`)
340 pub fn dispatch_keystroke(
341 &mut self,
342 window: AnyWindowHandle,
343 keystroke: Keystroke,
344 is_held: bool,
345 ) {
346 self.test_window(window)
347 .simulate_keystroke(keystroke, is_held)
348 }
349
350 /// Returns the `TestWindow` backing the given handle.
351 pub fn test_window(&self, window: AnyWindowHandle) -> TestWindow {
352 self.app
353 .borrow_mut()
354 .windows
355 .get_mut(window.id)
356 .unwrap()
357 .as_mut()
358 .unwrap()
359 .platform_window
360 .as_test()
361 .unwrap()
362 .clone()
363 }
364
365 /// Returns a stream of notifications whenever the View or Model is updated.
366 pub fn notifications<T: 'static>(&mut self, entity: &impl Entity<T>) -> impl Stream<Item = ()> {
367 let (tx, rx) = futures::channel::mpsc::unbounded();
368 self.update(|cx| {
369 cx.observe(entity, {
370 let tx = tx.clone();
371 move |_, _| {
372 let _ = tx.unbounded_send(());
373 }
374 })
375 .detach();
376 cx.observe_release(entity, move |_, _| tx.close_channel())
377 .detach()
378 });
379 rx
380 }
381
382 /// Retuens a stream of events emitted by the given Model.
383 pub fn events<Evt, T: 'static + EventEmitter<Evt>>(
384 &mut self,
385 entity: &Model<T>,
386 ) -> futures::channel::mpsc::UnboundedReceiver<Evt>
387 where
388 Evt: 'static + Clone,
389 {
390 let (tx, rx) = futures::channel::mpsc::unbounded();
391 entity
392 .update(self, |_, cx: &mut ModelContext<T>| {
393 cx.subscribe(entity, move |_model, _handle, event, _cx| {
394 let _ = tx.unbounded_send(event.clone());
395 })
396 })
397 .detach();
398 rx
399 }
400
401 /// Runs until the given condition becomes true. (Prefer `run_until_parked` if you
402 /// don't need to jump in at a specific time).
403 pub async fn condition<T: 'static>(
404 &mut self,
405 model: &Model<T>,
406 mut predicate: impl FnMut(&mut T, &mut ModelContext<T>) -> bool,
407 ) {
408 let timer = self.executor().timer(Duration::from_secs(3));
409 let mut notifications = self.notifications(model);
410
411 use futures::FutureExt as _;
412 use smol::future::FutureExt as _;
413
414 async {
415 loop {
416 if model.update(self, &mut predicate) {
417 return Ok(());
418 }
419
420 if notifications.next().await.is_none() {
421 bail!("model dropped")
422 }
423 }
424 }
425 .race(timer.map(|_| Err(anyhow!("condition timed out"))))
426 .await
427 .unwrap();
428 }
429}
430
431impl<T: Send> Model<T> {
432 /// Block until the next event is emitted by the model, then return it.
433 pub fn next_event<Evt>(&self, cx: &mut TestAppContext) -> Evt
434 where
435 Evt: Send + Clone + 'static,
436 T: EventEmitter<Evt>,
437 {
438 let (tx, mut rx) = futures::channel::mpsc::unbounded();
439 let _subscription = self.update(cx, |_, cx| {
440 cx.subscribe(self, move |_, _, event, _| {
441 tx.unbounded_send(event.clone()).ok();
442 })
443 });
444
445 // Run other tasks until the event is emitted.
446 loop {
447 match rx.try_next() {
448 Ok(Some(event)) => return event,
449 Ok(None) => panic!("model was dropped"),
450 Err(_) => {
451 if !cx.executor().tick() {
452 break;
453 }
454 }
455 }
456 }
457 panic!("no event received")
458 }
459}
460
461impl<V: 'static> View<V> {
462 /// Returns a future that resolves when the view is next updated.
463 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
464 use postage::prelude::{Sink as _, Stream as _};
465
466 let (mut tx, mut rx) = postage::mpsc::channel(1);
467 let mut cx = cx.app.app.borrow_mut();
468 let subscription = cx.observe(self, move |_, _| {
469 tx.try_send(()).ok();
470 });
471
472 let duration = if std::env::var("CI").is_ok() {
473 Duration::from_secs(5)
474 } else {
475 Duration::from_secs(1)
476 };
477
478 async move {
479 let notification = crate::util::timeout(duration, rx.recv())
480 .await
481 .expect("next notification timed out");
482 drop(subscription);
483 notification.expect("model dropped while test was waiting for its next notification")
484 }
485 }
486}
487
488impl<V> View<V> {
489 /// Returns a future that resolves when the condition becomes true.
490 pub fn condition<Evt>(
491 &self,
492 cx: &TestAppContext,
493 mut predicate: impl FnMut(&V, &AppContext) -> bool,
494 ) -> impl Future<Output = ()>
495 where
496 Evt: 'static,
497 V: EventEmitter<Evt>,
498 {
499 use postage::prelude::{Sink as _, Stream as _};
500
501 let (tx, mut rx) = postage::mpsc::channel(1024);
502 let timeout_duration = Duration::from_millis(100);
503
504 let mut cx = cx.app.borrow_mut();
505 let subscriptions = (
506 cx.observe(self, {
507 let mut tx = tx.clone();
508 move |_, _| {
509 tx.blocking_send(()).ok();
510 }
511 }),
512 cx.subscribe(self, {
513 let mut tx = tx.clone();
514 move |_, _: &Evt, _| {
515 tx.blocking_send(()).ok();
516 }
517 }),
518 );
519
520 let cx = cx.this.upgrade().unwrap();
521 let handle = self.downgrade();
522
523 async move {
524 crate::util::timeout(timeout_duration, async move {
525 loop {
526 {
527 let cx = cx.borrow();
528 let cx = &*cx;
529 if predicate(
530 handle
531 .upgrade()
532 .expect("view dropped with pending condition")
533 .read(cx),
534 cx,
535 ) {
536 break;
537 }
538 }
539
540 cx.borrow().background_executor().start_waiting();
541 rx.recv()
542 .await
543 .expect("view dropped with pending condition");
544 cx.borrow().background_executor().finish_waiting();
545 }
546 })
547 .await
548 .expect("condition timed out");
549 drop(subscriptions);
550 }
551 }
552}
553
554use derive_more::{Deref, DerefMut};
555#[derive(Deref, DerefMut, Clone)]
556/// A VisualTestContext is the test-equivalent of a `WindowContext`. It allows you to
557/// run window-specific test code.
558pub struct VisualTestContext {
559 #[deref]
560 #[deref_mut]
561 /// cx is the original TestAppContext (you can more easily access this using Deref)
562 pub cx: TestAppContext,
563 window: AnyWindowHandle,
564}
565
566impl<'a> VisualTestContext {
567 /// Provides the `WindowContext` for the duration of the closure.
568 pub fn update<R>(&mut self, f: impl FnOnce(&mut WindowContext) -> R) -> R {
569 self.cx.update_window(self.window, |_, cx| f(cx)).unwrap()
570 }
571
572 /// Create a new VisualTestContext. You would typically shadow the passed in
573 /// TestAppContext with this, as this is typically more useful.
574 /// `let cx = VisualTestContext::from_window(window, cx);`
575 pub fn from_window(window: AnyWindowHandle, cx: &TestAppContext) -> Self {
576 Self {
577 cx: cx.clone(),
578 window,
579 }
580 }
581
582 /// Wait until there are no more pending tasks.
583 pub fn run_until_parked(&self) {
584 self.cx.background_executor.run_until_parked();
585 }
586
587 /// Dispatch the action to the currently focused node.
588 pub fn dispatch_action<A>(&mut self, action: A)
589 where
590 A: Action,
591 {
592 self.cx.dispatch_action(self.window, action)
593 }
594
595 /// Read the title off the window (set by `WindowContext#set_window_title`)
596 pub fn window_title(&mut self) -> Option<String> {
597 self.cx.test_window(self.window).0.lock().title.clone()
598 }
599
600 /// Simulate a sequence of keystrokes `cx.simulate_keystrokes("cmd-p escape")`
601 /// Automatically runs until parked.
602 pub fn simulate_keystrokes(&mut self, keystrokes: &str) {
603 self.cx.simulate_keystrokes(self.window, keystrokes)
604 }
605
606 /// Simulate typing text `cx.simulate_input("hello")`
607 /// Automatically runs until parked.
608 pub fn simulate_input(&mut self, input: &str) {
609 self.cx.simulate_input(self.window, input)
610 }
611
612 /// Simulates the user blurring the window.
613 pub fn deactivate_window(&mut self) {
614 if Some(self.window) == self.test_platform.active_window() {
615 self.test_platform.set_active_window(None)
616 }
617 self.background_executor.run_until_parked();
618 }
619
620 /// Simulates the user closing the window.
621 /// Returns true if the window was closed.
622 pub fn simulate_close(&mut self) -> bool {
623 let handler = self
624 .cx
625 .update_window(self.window, |_, cx| {
626 cx.window
627 .platform_window
628 .as_test()
629 .unwrap()
630 .0
631 .lock()
632 .should_close_handler
633 .take()
634 })
635 .unwrap();
636 if let Some(mut handler) = handler {
637 let should_close = handler();
638 self.cx
639 .update_window(self.window, |_, cx| {
640 cx.window.platform_window.on_should_close(handler);
641 })
642 .unwrap();
643 should_close
644 } else {
645 false
646 }
647 }
648}
649
650impl Context for VisualTestContext {
651 type Result<T> = <TestAppContext as Context>::Result<T>;
652
653 fn new_model<T: 'static>(
654 &mut self,
655 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
656 ) -> Self::Result<Model<T>> {
657 self.cx.new_model(build_model)
658 }
659
660 fn update_model<T, R>(
661 &mut self,
662 handle: &Model<T>,
663 update: impl FnOnce(&mut T, &mut ModelContext<'_, T>) -> R,
664 ) -> Self::Result<R>
665 where
666 T: 'static,
667 {
668 self.cx.update_model(handle, update)
669 }
670
671 fn read_model<T, R>(
672 &self,
673 handle: &Model<T>,
674 read: impl FnOnce(&T, &AppContext) -> R,
675 ) -> Self::Result<R>
676 where
677 T: 'static,
678 {
679 self.cx.read_model(handle, read)
680 }
681
682 fn update_window<T, F>(&mut self, window: AnyWindowHandle, f: F) -> Result<T>
683 where
684 F: FnOnce(AnyView, &mut WindowContext<'_>) -> T,
685 {
686 self.cx.update_window(window, f)
687 }
688
689 fn read_window<T, R>(
690 &self,
691 window: &WindowHandle<T>,
692 read: impl FnOnce(View<T>, &AppContext) -> R,
693 ) -> Result<R>
694 where
695 T: 'static,
696 {
697 self.cx.read_window(window, read)
698 }
699}
700
701impl VisualContext for VisualTestContext {
702 fn new_view<V>(
703 &mut self,
704 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
705 ) -> Self::Result<View<V>>
706 where
707 V: 'static + Render,
708 {
709 self.window
710 .update(&mut self.cx, |_, cx| cx.new_view(build_view))
711 .unwrap()
712 }
713
714 fn update_view<V: 'static, R>(
715 &mut self,
716 view: &View<V>,
717 update: impl FnOnce(&mut V, &mut ViewContext<'_, V>) -> R,
718 ) -> Self::Result<R> {
719 self.window
720 .update(&mut self.cx, |_, cx| cx.update_view(view, update))
721 .unwrap()
722 }
723
724 fn replace_root_view<V>(
725 &mut self,
726 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
727 ) -> Self::Result<View<V>>
728 where
729 V: 'static + Render,
730 {
731 self.window
732 .update(&mut self.cx, |_, cx| cx.replace_root_view(build_view))
733 .unwrap()
734 }
735
736 fn focus_view<V: crate::FocusableView>(&mut self, view: &View<V>) -> Self::Result<()> {
737 self.window
738 .update(&mut self.cx, |_, cx| {
739 view.read(cx).focus_handle(cx).clone().focus(cx)
740 })
741 .unwrap()
742 }
743
744 fn dismiss_view<V>(&mut self, view: &View<V>) -> Self::Result<()>
745 where
746 V: crate::ManagedView,
747 {
748 self.window
749 .update(&mut self.cx, |_, cx| {
750 view.update(cx, |_, cx| cx.emit(crate::DismissEvent))
751 })
752 .unwrap()
753 }
754}
755
756impl AnyWindowHandle {
757 /// Creates the given view in this window.
758 pub fn build_view<V: Render + 'static>(
759 &self,
760 cx: &mut TestAppContext,
761 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
762 ) -> View<V> {
763 self.update(cx, |_, cx| cx.new_view(build_view)).unwrap()
764 }
765}
766
767/// An EmptyView for testing.
768pub struct EmptyView {}
769
770impl Render for EmptyView {
771 fn render(&mut self, _cx: &mut crate::ViewContext<Self>) -> impl IntoElement {
772 div()
773 }
774}