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 // it might be nice to try and cleanup these at the end of each test.
190 (view, Box::leak(cx))
191 }
192
193 /// returns the TextSystem
194 pub fn text_system(&self) -> &Arc<TextSystem> {
195 &self.text_system
196 }
197
198 /// Simulates writing to the platform clipboard
199 pub fn write_to_clipboard(&self, item: ClipboardItem) {
200 self.test_platform.write_to_clipboard(item)
201 }
202
203 /// Simulates reading from the platform clipboard.
204 /// This will return the most recent value from `write_to_clipboard`.
205 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
206 self.test_platform.read_from_clipboard()
207 }
208
209 /// Simulates choosing a File in the platform's "Open" dialog.
210 pub fn simulate_new_path_selection(
211 &self,
212 select_path: impl FnOnce(&std::path::Path) -> Option<std::path::PathBuf>,
213 ) {
214 self.test_platform.simulate_new_path_selection(select_path);
215 }
216
217 /// Simulates clicking a button in an platform-level alert dialog.
218 pub fn simulate_prompt_answer(&self, button_ix: usize) {
219 self.test_platform.simulate_prompt_answer(button_ix);
220 }
221
222 /// Returns true if there's an alert dialog open.
223 pub fn has_pending_prompt(&self) -> bool {
224 self.test_platform.has_pending_prompt()
225 }
226
227 /// Simulates the user resizing the window to the new size.
228 pub fn simulate_window_resize(&self, window_handle: AnyWindowHandle, size: Size<Pixels>) {
229 self.test_window(window_handle).simulate_resize(size);
230 }
231
232 /// Returns all windows open in the test.
233 pub fn windows(&self) -> Vec<AnyWindowHandle> {
234 self.app.borrow().windows().clone()
235 }
236
237 /// Run the given task on the main thread.
238 pub fn spawn<Fut, R>(&self, f: impl FnOnce(AsyncAppContext) -> Fut) -> Task<R>
239 where
240 Fut: Future<Output = R> + 'static,
241 R: 'static,
242 {
243 self.foreground_executor.spawn(f(self.to_async()))
244 }
245
246 /// true if the given global is defined
247 pub fn has_global<G: 'static>(&self) -> bool {
248 let app = self.app.borrow();
249 app.has_global::<G>()
250 }
251
252 /// runs the given closure with a reference to the global
253 /// panics if `has_global` would return false.
254 pub fn read_global<G: 'static, R>(&self, read: impl FnOnce(&G, &AppContext) -> R) -> R {
255 let app = self.app.borrow();
256 read(app.global(), &app)
257 }
258
259 /// runs the given closure with a reference to the global (if set)
260 pub fn try_read_global<G: 'static, R>(
261 &self,
262 read: impl FnOnce(&G, &AppContext) -> R,
263 ) -> Option<R> {
264 let lock = self.app.borrow();
265 Some(read(lock.try_global()?, &lock))
266 }
267
268 /// sets the global in this context.
269 pub fn set_global<G: 'static>(&mut self, global: G) {
270 let mut lock = self.app.borrow_mut();
271 lock.set_global(global);
272 }
273
274 /// updates the global in this context. (panics if `has_global` would return false)
275 pub fn update_global<G: 'static, R>(
276 &mut self,
277 update: impl FnOnce(&mut G, &mut AppContext) -> R,
278 ) -> R {
279 let mut lock = self.app.borrow_mut();
280 lock.update_global(update)
281 }
282
283 /// Returns an `AsyncAppContext` which can be used to run tasks that expect to be on a background
284 /// thread on the current thread in tests.
285 pub fn to_async(&self) -> AsyncAppContext {
286 AsyncAppContext {
287 app: Rc::downgrade(&self.app),
288 background_executor: self.background_executor.clone(),
289 foreground_executor: self.foreground_executor.clone(),
290 }
291 }
292
293 /// Wait until there are no more pending tasks.
294 pub fn run_until_parked(&mut self) {
295 self.background_executor.run_until_parked()
296 }
297
298 /// Simulate dispatching an action to the currently focused node in the window.
299 pub fn dispatch_action<A>(&mut self, window: AnyWindowHandle, action: A)
300 where
301 A: Action,
302 {
303 window
304 .update(self, |_, cx| cx.dispatch_action(action.boxed_clone()))
305 .unwrap();
306
307 self.background_executor.run_until_parked()
308 }
309
310 /// simulate_keystrokes takes a space-separated list of keys to type.
311 /// cx.simulate_keystrokes("cmd-shift-p b k s p enter")
312 /// in Zed, this will run backspace on the current editor through the command palette.
313 /// This will also run the background executor until it's parked.
314 pub fn simulate_keystrokes(&mut self, window: AnyWindowHandle, keystrokes: &str) {
315 for keystroke in keystrokes
316 .split(" ")
317 .map(Keystroke::parse)
318 .map(Result::unwrap)
319 {
320 self.dispatch_keystroke(window, keystroke.into(), false);
321 }
322
323 self.background_executor.run_until_parked()
324 }
325
326 /// simulate_input takes a string of text to type.
327 /// cx.simulate_input("abc")
328 /// will type abc into your current editor
329 /// This will also run the background executor until it's parked.
330 pub fn simulate_input(&mut self, window: AnyWindowHandle, input: &str) {
331 for keystroke in input.split("").map(Keystroke::parse).map(Result::unwrap) {
332 self.dispatch_keystroke(window, keystroke.into(), false);
333 }
334
335 self.background_executor.run_until_parked()
336 }
337
338 /// dispatches a single Keystroke (see also `simulate_keystrokes` and `simulate_input`)
339 pub fn dispatch_keystroke(
340 &mut self,
341 window: AnyWindowHandle,
342 keystroke: Keystroke,
343 is_held: bool,
344 ) {
345 self.test_window(window)
346 .simulate_keystroke(keystroke, is_held)
347 }
348
349 /// Returns the `TestWindow` backing the given handle.
350 pub fn test_window(&self, window: AnyWindowHandle) -> TestWindow {
351 self.app
352 .borrow_mut()
353 .windows
354 .get_mut(window.id)
355 .unwrap()
356 .as_mut()
357 .unwrap()
358 .platform_window
359 .as_test()
360 .unwrap()
361 .clone()
362 }
363
364 /// Returns a stream of notifications whenever the View or Model is updated.
365 pub fn notifications<T: 'static>(&mut self, entity: &impl Entity<T>) -> impl Stream<Item = ()> {
366 let (tx, rx) = futures::channel::mpsc::unbounded();
367 self.update(|cx| {
368 cx.observe(entity, {
369 let tx = tx.clone();
370 move |_, _| {
371 let _ = tx.unbounded_send(());
372 }
373 })
374 .detach();
375 cx.observe_release(entity, move |_, _| tx.close_channel())
376 .detach()
377 });
378 rx
379 }
380
381 /// Retuens a stream of events emitted by the given Model.
382 pub fn events<Evt, T: 'static + EventEmitter<Evt>>(
383 &mut self,
384 entity: &Model<T>,
385 ) -> futures::channel::mpsc::UnboundedReceiver<Evt>
386 where
387 Evt: 'static + Clone,
388 {
389 let (tx, rx) = futures::channel::mpsc::unbounded();
390 entity
391 .update(self, |_, cx: &mut ModelContext<T>| {
392 cx.subscribe(entity, move |_model, _handle, event, _cx| {
393 let _ = tx.unbounded_send(event.clone());
394 })
395 })
396 .detach();
397 rx
398 }
399
400 /// Runs until the given condition becomes true. (Prefer `run_until_parked` if you
401 /// don't need to jump in at a specific time).
402 pub async fn condition<T: 'static>(
403 &mut self,
404 model: &Model<T>,
405 mut predicate: impl FnMut(&mut T, &mut ModelContext<T>) -> bool,
406 ) {
407 let timer = self.executor().timer(Duration::from_secs(3));
408 let mut notifications = self.notifications(model);
409
410 use futures::FutureExt as _;
411 use smol::future::FutureExt as _;
412
413 async {
414 loop {
415 if model.update(self, &mut predicate) {
416 return Ok(());
417 }
418
419 if notifications.next().await.is_none() {
420 bail!("model dropped")
421 }
422 }
423 }
424 .race(timer.map(|_| Err(anyhow!("condition timed out"))))
425 .await
426 .unwrap();
427 }
428}
429
430impl<T: Send> Model<T> {
431 /// Block until the next event is emitted by the model, then return it.
432 pub fn next_event<Evt>(&self, cx: &mut TestAppContext) -> Evt
433 where
434 Evt: Send + Clone + 'static,
435 T: EventEmitter<Evt>,
436 {
437 let (tx, mut rx) = futures::channel::mpsc::unbounded();
438 let _subscription = self.update(cx, |_, cx| {
439 cx.subscribe(self, move |_, _, event, _| {
440 tx.unbounded_send(event.clone()).ok();
441 })
442 });
443
444 // Run other tasks until the event is emitted.
445 loop {
446 match rx.try_next() {
447 Ok(Some(event)) => return event,
448 Ok(None) => panic!("model was dropped"),
449 Err(_) => {
450 if !cx.executor().tick() {
451 break;
452 }
453 }
454 }
455 }
456 panic!("no event received")
457 }
458}
459
460impl<V: 'static> View<V> {
461 /// Returns a future that resolves when the view is next updated.
462 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
463 use postage::prelude::{Sink as _, Stream as _};
464
465 let (mut tx, mut rx) = postage::mpsc::channel(1);
466 let mut cx = cx.app.app.borrow_mut();
467 let subscription = cx.observe(self, move |_, _| {
468 tx.try_send(()).ok();
469 });
470
471 let duration = if std::env::var("CI").is_ok() {
472 Duration::from_secs(5)
473 } else {
474 Duration::from_secs(1)
475 };
476
477 async move {
478 let notification = crate::util::timeout(duration, rx.recv())
479 .await
480 .expect("next notification timed out");
481 drop(subscription);
482 notification.expect("model dropped while test was waiting for its next notification")
483 }
484 }
485}
486
487impl<V> View<V> {
488 /// Returns a future that resolves when the condition becomes true.
489 pub fn condition<Evt>(
490 &self,
491 cx: &TestAppContext,
492 mut predicate: impl FnMut(&V, &AppContext) -> bool,
493 ) -> impl Future<Output = ()>
494 where
495 Evt: 'static,
496 V: EventEmitter<Evt>,
497 {
498 use postage::prelude::{Sink as _, Stream as _};
499
500 let (tx, mut rx) = postage::mpsc::channel(1024);
501 let timeout_duration = Duration::from_millis(100);
502
503 let mut cx = cx.app.borrow_mut();
504 let subscriptions = (
505 cx.observe(self, {
506 let mut tx = tx.clone();
507 move |_, _| {
508 tx.blocking_send(()).ok();
509 }
510 }),
511 cx.subscribe(self, {
512 let mut tx = tx.clone();
513 move |_, _: &Evt, _| {
514 tx.blocking_send(()).ok();
515 }
516 }),
517 );
518
519 let cx = cx.this.upgrade().unwrap();
520 let handle = self.downgrade();
521
522 async move {
523 crate::util::timeout(timeout_duration, async move {
524 loop {
525 {
526 let cx = cx.borrow();
527 let cx = &*cx;
528 if predicate(
529 handle
530 .upgrade()
531 .expect("view dropped with pending condition")
532 .read(cx),
533 cx,
534 ) {
535 break;
536 }
537 }
538
539 cx.borrow().background_executor().start_waiting();
540 rx.recv()
541 .await
542 .expect("view dropped with pending condition");
543 cx.borrow().background_executor().finish_waiting();
544 }
545 })
546 .await
547 .expect("condition timed out");
548 drop(subscriptions);
549 }
550 }
551}
552
553use derive_more::{Deref, DerefMut};
554#[derive(Deref, DerefMut, Clone)]
555/// A VisualTestContext is the test-equivalent of a `WindowContext`. It allows you to
556/// run window-specific test code.
557pub struct VisualTestContext {
558 #[deref]
559 #[deref_mut]
560 /// cx is the original TestAppContext (you can more easily access this using Deref)
561 pub cx: TestAppContext,
562 window: AnyWindowHandle,
563}
564
565impl<'a> VisualTestContext {
566 /// Provides the `WindowContext` for the duration of the closure.
567 pub fn update<R>(&mut self, f: impl FnOnce(&mut WindowContext) -> R) -> R {
568 self.cx.update_window(self.window, |_, cx| f(cx)).unwrap()
569 }
570
571 /// Create a new VisualTestContext. You would typically shadow the passed in
572 /// TestAppContext with this, as this is typically more useful.
573 /// `let cx = VisualTestContext::from_window(window, cx);`
574 pub fn from_window(window: AnyWindowHandle, cx: &TestAppContext) -> Self {
575 Self {
576 cx: cx.clone(),
577 window,
578 }
579 }
580
581 /// Wait until there are no more pending tasks.
582 pub fn run_until_parked(&self) {
583 self.cx.background_executor.run_until_parked();
584 }
585
586 /// Dispatch the action to the currently focused node.
587 pub fn dispatch_action<A>(&mut self, action: A)
588 where
589 A: Action,
590 {
591 self.cx.dispatch_action(self.window, action)
592 }
593
594 /// Read the title off the window (set by `WindowContext#set_window_title`)
595 pub fn window_title(&mut self) -> Option<String> {
596 self.cx.test_window(self.window).0.lock().title.clone()
597 }
598
599 /// Simulate a sequence of keystrokes `cx.simulate_keystrokes("cmd-p escape")`
600 /// Automatically runs until parked.
601 pub fn simulate_keystrokes(&mut self, keystrokes: &str) {
602 self.cx.simulate_keystrokes(self.window, keystrokes)
603 }
604
605 /// Simulate typing text `cx.simulate_input("hello")`
606 /// Automatically runs until parked.
607 pub fn simulate_input(&mut self, input: &str) {
608 self.cx.simulate_input(self.window, input)
609 }
610
611 /// Simulates the user blurring the window.
612 pub fn deactivate_window(&mut self) {
613 if Some(self.window) == self.test_platform.active_window() {
614 self.test_platform.set_active_window(None)
615 }
616 self.background_executor.run_until_parked();
617 }
618
619 /// Simulates the user closing the window.
620 /// Returns true if the window was closed.
621 pub fn simulate_close(&mut self) -> bool {
622 let handler = self
623 .cx
624 .update_window(self.window, |_, cx| {
625 cx.window
626 .platform_window
627 .as_test()
628 .unwrap()
629 .0
630 .lock()
631 .should_close_handler
632 .take()
633 })
634 .unwrap();
635 if let Some(mut handler) = handler {
636 let should_close = handler();
637 self.cx
638 .update_window(self.window, |_, cx| {
639 cx.window.platform_window.on_should_close(handler);
640 })
641 .unwrap();
642 should_close
643 } else {
644 false
645 }
646 }
647}
648
649impl Context for VisualTestContext {
650 type Result<T> = <TestAppContext as Context>::Result<T>;
651
652 fn new_model<T: 'static>(
653 &mut self,
654 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
655 ) -> Self::Result<Model<T>> {
656 self.cx.new_model(build_model)
657 }
658
659 fn update_model<T, R>(
660 &mut self,
661 handle: &Model<T>,
662 update: impl FnOnce(&mut T, &mut ModelContext<'_, T>) -> R,
663 ) -> Self::Result<R>
664 where
665 T: 'static,
666 {
667 self.cx.update_model(handle, update)
668 }
669
670 fn read_model<T, R>(
671 &self,
672 handle: &Model<T>,
673 read: impl FnOnce(&T, &AppContext) -> R,
674 ) -> Self::Result<R>
675 where
676 T: 'static,
677 {
678 self.cx.read_model(handle, read)
679 }
680
681 fn update_window<T, F>(&mut self, window: AnyWindowHandle, f: F) -> Result<T>
682 where
683 F: FnOnce(AnyView, &mut WindowContext<'_>) -> T,
684 {
685 self.cx.update_window(window, f)
686 }
687
688 fn read_window<T, R>(
689 &self,
690 window: &WindowHandle<T>,
691 read: impl FnOnce(View<T>, &AppContext) -> R,
692 ) -> Result<R>
693 where
694 T: 'static,
695 {
696 self.cx.read_window(window, read)
697 }
698}
699
700impl VisualContext for VisualTestContext {
701 fn new_view<V>(
702 &mut self,
703 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
704 ) -> Self::Result<View<V>>
705 where
706 V: 'static + Render,
707 {
708 self.window
709 .update(&mut self.cx, |_, cx| cx.new_view(build_view))
710 .unwrap()
711 }
712
713 fn update_view<V: 'static, R>(
714 &mut self,
715 view: &View<V>,
716 update: impl FnOnce(&mut V, &mut ViewContext<'_, V>) -> R,
717 ) -> Self::Result<R> {
718 self.window
719 .update(&mut self.cx, |_, cx| cx.update_view(view, update))
720 .unwrap()
721 }
722
723 fn replace_root_view<V>(
724 &mut self,
725 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
726 ) -> Self::Result<View<V>>
727 where
728 V: 'static + Render,
729 {
730 self.window
731 .update(&mut self.cx, |_, cx| cx.replace_root_view(build_view))
732 .unwrap()
733 }
734
735 fn focus_view<V: crate::FocusableView>(&mut self, view: &View<V>) -> Self::Result<()> {
736 self.window
737 .update(&mut self.cx, |_, cx| {
738 view.read(cx).focus_handle(cx).clone().focus(cx)
739 })
740 .unwrap()
741 }
742
743 fn dismiss_view<V>(&mut self, view: &View<V>) -> Self::Result<()>
744 where
745 V: crate::ManagedView,
746 {
747 self.window
748 .update(&mut self.cx, |_, cx| {
749 view.update(cx, |_, cx| cx.emit(crate::DismissEvent))
750 })
751 .unwrap()
752 }
753}
754
755impl AnyWindowHandle {
756 /// Creates the given view in this window.
757 pub fn build_view<V: Render + 'static>(
758 &self,
759 cx: &mut TestAppContext,
760 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
761 ) -> View<V> {
762 self.update(cx, |_, cx| cx.new_view(build_view)).unwrap()
763 }
764}
765
766/// An EmptyView for testing.
767pub struct EmptyView {}
768
769impl Render for EmptyView {
770 fn render(&mut self, _cx: &mut crate::ViewContext<Self>) -> impl IntoElement {
771 div()
772 }
773}