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