1use crate::{
2 Action, AnyView, AnyWindowHandle, AppCell, AppContext, AsyncAppContext, AvailableSpace,
3 BackgroundExecutor, BorrowAppContext, Bounds, ClipboardItem, Context, DrawPhase, Drawable,
4 Element, Empty, Entity, EventEmitter, ForegroundExecutor, Global, InputEvent, Keystroke, Model,
5 ModelContext, Modifiers, ModifiersChangedEvent, MouseButton, MouseDownEvent, MouseMoveEvent,
6 MouseUpEvent, Pixels, Platform, Point, Render, Result, Size, Task, TestDispatcher,
7 TestPlatform, TestWindow, TextSystem, View, ViewContext, VisualContext, WindowContext,
8 WindowHandle, WindowOptions,
9};
10use anyhow::{anyhow, bail};
11use futures::{channel::oneshot, Stream, StreamExt};
12use std::{cell::RefCell, 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 on_quit: Rc<RefCell<Vec<Box<dyn FnOnce() + 'static>>>>,
30}
31
32impl Context for TestAppContext {
33 type Result<T> = T;
34
35 fn new_model<T: 'static>(
36 &mut self,
37 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
38 ) -> Self::Result<Model<T>>
39 where
40 T: 'static,
41 {
42 let mut app = self.app.borrow_mut();
43 app.new_model(build_model)
44 }
45
46 fn reserve_model<T: 'static>(&mut self) -> Self::Result<crate::Reservation<T>> {
47 let mut app = self.app.borrow_mut();
48 app.reserve_model()
49 }
50
51 fn insert_model<T: 'static>(
52 &mut self,
53 reservation: crate::Reservation<T>,
54 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
55 ) -> Self::Result<Model<T>> {
56 let mut app = self.app.borrow_mut();
57 app.insert_model(reservation, build_model)
58 }
59
60 fn update_model<T: 'static, R>(
61 &mut self,
62 handle: &Model<T>,
63 update: impl FnOnce(&mut T, &mut ModelContext<'_, T>) -> R,
64 ) -> Self::Result<R> {
65 let mut app = self.app.borrow_mut();
66 app.update_model(handle, update)
67 }
68
69 fn read_model<T, R>(
70 &self,
71 handle: &Model<T>,
72 read: impl FnOnce(&T, &AppContext) -> R,
73 ) -> Self::Result<R>
74 where
75 T: 'static,
76 {
77 let app = self.app.borrow();
78 app.read_model(handle, read)
79 }
80
81 fn update_window<T, F>(&mut self, window: AnyWindowHandle, f: F) -> Result<T>
82 where
83 F: FnOnce(AnyView, &mut WindowContext<'_>) -> T,
84 {
85 let mut lock = self.app.borrow_mut();
86 lock.update_window(window, f)
87 }
88
89 fn read_window<T, R>(
90 &self,
91 window: &WindowHandle<T>,
92 read: impl FnOnce(View<T>, &AppContext) -> R,
93 ) -> Result<R>
94 where
95 T: 'static,
96 {
97 let app = self.app.borrow();
98 app.read_window(window, read)
99 }
100}
101
102impl TestAppContext {
103 /// Creates a new `TestAppContext`. Usually you can rely on `#[gpui::test]` to do this for you.
104 pub fn new(dispatcher: TestDispatcher, fn_name: Option<&'static str>) -> Self {
105 let arc_dispatcher = Arc::new(dispatcher.clone());
106 let background_executor = BackgroundExecutor::new(arc_dispatcher.clone());
107 let foreground_executor = ForegroundExecutor::new(arc_dispatcher);
108 let platform = TestPlatform::new(background_executor.clone(), foreground_executor.clone());
109 let asset_source = Arc::new(());
110 let http_client = util::http::FakeHttpClient::with_404_response();
111 let text_system = Arc::new(TextSystem::new(platform.text_system()));
112
113 Self {
114 app: AppContext::new(platform.clone(), asset_source, http_client),
115 background_executor,
116 foreground_executor,
117 dispatcher: dispatcher.clone(),
118 test_platform: platform,
119 text_system,
120 fn_name,
121 on_quit: Rc::new(RefCell::new(Vec::default())),
122 }
123 }
124
125 /// The name of the test function that created this `TestAppContext`
126 pub fn test_function_name(&self) -> Option<&'static str> {
127 self.fn_name
128 }
129
130 /// Checks whether there have been any new path prompts received by the platform.
131 pub fn did_prompt_for_new_path(&self) -> bool {
132 self.test_platform.did_prompt_for_new_path()
133 }
134
135 /// returns a new `TestAppContext` re-using the same executors to interleave tasks.
136 pub fn new_app(&self) -> TestAppContext {
137 Self::new(self.dispatcher.clone(), self.fn_name)
138 }
139
140 /// Called by the test helper to end the test.
141 /// public so the macro can call it.
142 pub fn quit(&self) {
143 self.on_quit.borrow_mut().drain(..).for_each(|f| f());
144 self.app.borrow_mut().shutdown();
145 }
146
147 /// Register cleanup to run when the test ends.
148 pub fn on_quit(&mut self, f: impl FnOnce() + 'static) {
149 self.on_quit.borrow_mut().push(Box::new(f));
150 }
151
152 /// Schedules all windows to be redrawn on the next effect cycle.
153 pub fn refresh(&mut self) -> Result<()> {
154 let mut app = self.app.borrow_mut();
155 app.refresh();
156 Ok(())
157 }
158
159 /// Returns an executor (for running tasks in the background)
160 pub fn executor(&self) -> BackgroundExecutor {
161 self.background_executor.clone()
162 }
163
164 /// Returns an executor (for running tasks on the main thread)
165 pub fn foreground_executor(&self) -> &ForegroundExecutor {
166 &self.foreground_executor
167 }
168
169 /// Gives you an `&mut AppContext` for the duration of the closure
170 pub fn update<R>(&self, f: impl FnOnce(&mut AppContext) -> R) -> R {
171 let mut cx = self.app.borrow_mut();
172 cx.update(f)
173 }
174
175 /// Gives you an `&AppContext` for the duration of the closure
176 pub fn read<R>(&self, f: impl FnOnce(&AppContext) -> R) -> R {
177 let cx = self.app.borrow();
178 f(&cx)
179 }
180
181 /// Adds a new window. The Window will always be backed by a `TestWindow` which
182 /// can be retrieved with `self.test_window(handle)`
183 pub fn add_window<F, V>(&mut self, build_window: F) -> WindowHandle<V>
184 where
185 F: FnOnce(&mut ViewContext<V>) -> V,
186 V: 'static + Render,
187 {
188 let mut cx = self.app.borrow_mut();
189
190 // Some tests rely on the window size matching the bounds of the test display
191 let bounds = Bounds::maximized(None, &mut cx);
192 cx.open_window(
193 WindowOptions {
194 bounds: Some(bounds),
195 ..Default::default()
196 },
197 |cx| cx.new_view(build_window),
198 )
199 }
200
201 /// Adds a new window with no content.
202 pub fn add_empty_window(&mut self) -> &mut VisualTestContext {
203 let mut cx = self.app.borrow_mut();
204 let bounds = Bounds::maximized(None, &mut cx);
205 let window = cx.open_window(
206 WindowOptions {
207 bounds: Some(bounds),
208 ..Default::default()
209 },
210 |cx| cx.new_view(|_| Empty),
211 );
212 drop(cx);
213 let cx = VisualTestContext::from_window(*window.deref(), self).as_mut();
214 cx.run_until_parked();
215 cx
216 }
217
218 /// Adds a new window, and returns its root view and a `VisualTestContext` which can be used
219 /// as a `WindowContext` for the rest of the test. Typically you would shadow this context with
220 /// the returned one. `let (view, cx) = cx.add_window_view(...);`
221 pub fn add_window_view<F, V>(&mut self, build_root_view: F) -> (View<V>, &mut VisualTestContext)
222 where
223 F: FnOnce(&mut ViewContext<V>) -> V,
224 V: 'static + Render,
225 {
226 let mut cx = self.app.borrow_mut();
227 let bounds = Bounds::maximized(None, &mut cx);
228 let window = cx.open_window(
229 WindowOptions {
230 bounds: Some(bounds),
231 ..Default::default()
232 },
233 |cx| cx.new_view(build_root_view),
234 );
235 drop(cx);
236 let view = window.root_view(self).unwrap();
237 let cx = VisualTestContext::from_window(*window.deref(), self).as_mut();
238 cx.run_until_parked();
239
240 // it might be nice to try and cleanup these at the end of each test.
241 (view, cx)
242 }
243
244 /// returns the TextSystem
245 pub fn text_system(&self) -> &Arc<TextSystem> {
246 &self.text_system
247 }
248
249 /// Simulates writing to the platform clipboard
250 pub fn write_to_clipboard(&self, item: ClipboardItem) {
251 self.test_platform.write_to_clipboard(item)
252 }
253
254 /// Simulates reading from the platform clipboard.
255 /// This will return the most recent value from `write_to_clipboard`.
256 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
257 self.test_platform.read_from_clipboard()
258 }
259
260 /// Simulates choosing a File in the platform's "Open" dialog.
261 pub fn simulate_new_path_selection(
262 &self,
263 select_path: impl FnOnce(&std::path::Path) -> Option<std::path::PathBuf>,
264 ) {
265 self.test_platform.simulate_new_path_selection(select_path);
266 }
267
268 /// Simulates clicking a button in an platform-level alert dialog.
269 pub fn simulate_prompt_answer(&self, button_ix: usize) {
270 self.test_platform.simulate_prompt_answer(button_ix);
271 }
272
273 /// Returns true if there's an alert dialog open.
274 pub fn has_pending_prompt(&self) -> bool {
275 self.test_platform.has_pending_prompt()
276 }
277
278 /// All the urls that have been opened with cx.open_url() during this test.
279 pub fn opened_url(&self) -> Option<String> {
280 self.test_platform.opened_url.borrow().clone()
281 }
282
283 /// Simulates the user resizing the window to the new size.
284 pub fn simulate_window_resize(&self, window_handle: AnyWindowHandle, size: Size<Pixels>) {
285 self.test_window(window_handle).simulate_resize(size);
286 }
287
288 /// Returns all windows open in the test.
289 pub fn windows(&self) -> Vec<AnyWindowHandle> {
290 self.app.borrow().windows().clone()
291 }
292
293 /// Run the given task on the main thread.
294 pub fn spawn<Fut, R>(&self, f: impl FnOnce(AsyncAppContext) -> Fut) -> Task<R>
295 where
296 Fut: Future<Output = R> + 'static,
297 R: 'static,
298 {
299 self.foreground_executor.spawn(f(self.to_async()))
300 }
301
302 /// true if the given global is defined
303 pub fn has_global<G: Global>(&self) -> bool {
304 let app = self.app.borrow();
305 app.has_global::<G>()
306 }
307
308 /// runs the given closure with a reference to the global
309 /// panics if `has_global` would return false.
310 pub fn read_global<G: Global, R>(&self, read: impl FnOnce(&G, &AppContext) -> R) -> R {
311 let app = self.app.borrow();
312 read(app.global(), &app)
313 }
314
315 /// runs the given closure with a reference to the global (if set)
316 pub fn try_read_global<G: Global, R>(
317 &self,
318 read: impl FnOnce(&G, &AppContext) -> R,
319 ) -> Option<R> {
320 let lock = self.app.borrow();
321 Some(read(lock.try_global()?, &lock))
322 }
323
324 /// sets the global in this context.
325 pub fn set_global<G: Global>(&mut self, global: G) {
326 let mut lock = self.app.borrow_mut();
327 lock.update(|cx| cx.set_global(global))
328 }
329
330 /// updates the global in this context. (panics if `has_global` would return false)
331 pub fn update_global<G: Global, R>(
332 &mut self,
333 update: impl FnOnce(&mut G, &mut AppContext) -> R,
334 ) -> R {
335 let mut lock = self.app.borrow_mut();
336 lock.update(|cx| cx.update_global(update))
337 }
338
339 /// Returns an `AsyncAppContext` which can be used to run tasks that expect to be on a background
340 /// thread on the current thread in tests.
341 pub fn to_async(&self) -> AsyncAppContext {
342 AsyncAppContext {
343 app: Rc::downgrade(&self.app),
344 background_executor: self.background_executor.clone(),
345 foreground_executor: self.foreground_executor.clone(),
346 }
347 }
348
349 /// Wait until there are no more pending tasks.
350 pub fn run_until_parked(&mut self) {
351 self.background_executor.run_until_parked()
352 }
353
354 /// Simulate dispatching an action to the currently focused node in the window.
355 pub fn dispatch_action<A>(&mut self, window: AnyWindowHandle, action: A)
356 where
357 A: Action,
358 {
359 window
360 .update(self, |_, cx| cx.dispatch_action(action.boxed_clone()))
361 .unwrap();
362
363 self.background_executor.run_until_parked()
364 }
365
366 /// simulate_keystrokes takes a space-separated list of keys to type.
367 /// cx.simulate_keystrokes("cmd-shift-p b k s p enter")
368 /// in Zed, this will run backspace on the current editor through the command palette.
369 /// This will also run the background executor until it's parked.
370 pub fn simulate_keystrokes(&mut self, window: AnyWindowHandle, keystrokes: &str) {
371 for keystroke in keystrokes
372 .split(' ')
373 .map(Keystroke::parse)
374 .map(Result::unwrap)
375 {
376 self.dispatch_keystroke(window, keystroke);
377 }
378
379 self.background_executor.run_until_parked()
380 }
381
382 /// simulate_input takes a string of text to type.
383 /// cx.simulate_input("abc")
384 /// will type abc into your current editor
385 /// This will also run the background executor until it's parked.
386 pub fn simulate_input(&mut self, window: AnyWindowHandle, input: &str) {
387 for keystroke in input.split("").map(Keystroke::parse).map(Result::unwrap) {
388 self.dispatch_keystroke(window, keystroke);
389 }
390
391 self.background_executor.run_until_parked()
392 }
393
394 /// dispatches a single Keystroke (see also `simulate_keystrokes` and `simulate_input`)
395 pub fn dispatch_keystroke(&mut self, window: AnyWindowHandle, keystroke: Keystroke) {
396 self.update_window(window, |_, cx| cx.dispatch_keystroke(keystroke))
397 .unwrap();
398 }
399
400 /// Returns the `TestWindow` backing the given handle.
401 pub(crate) fn test_window(&self, window: AnyWindowHandle) -> TestWindow {
402 self.app
403 .borrow_mut()
404 .windows
405 .get_mut(window.id)
406 .unwrap()
407 .as_mut()
408 .unwrap()
409 .platform_window
410 .as_test()
411 .unwrap()
412 .clone()
413 }
414
415 /// Returns a stream of notifications whenever the View or Model is updated.
416 pub fn notifications<T: 'static>(&mut self, entity: &impl Entity<T>) -> impl Stream<Item = ()> {
417 let (tx, rx) = futures::channel::mpsc::unbounded();
418 self.update(|cx| {
419 cx.observe(entity, {
420 let tx = tx.clone();
421 move |_, _| {
422 let _ = tx.unbounded_send(());
423 }
424 })
425 .detach();
426 cx.observe_release(entity, move |_, _| tx.close_channel())
427 .detach()
428 });
429 rx
430 }
431
432 /// Retuens a stream of events emitted by the given Model.
433 pub fn events<Evt, T: 'static + EventEmitter<Evt>>(
434 &mut self,
435 entity: &Model<T>,
436 ) -> futures::channel::mpsc::UnboundedReceiver<Evt>
437 where
438 Evt: 'static + Clone,
439 {
440 let (tx, rx) = futures::channel::mpsc::unbounded();
441 entity
442 .update(self, |_, cx: &mut ModelContext<T>| {
443 cx.subscribe(entity, move |_model, _handle, event, _cx| {
444 let _ = tx.unbounded_send(event.clone());
445 })
446 })
447 .detach();
448 rx
449 }
450
451 /// Runs until the given condition becomes true. (Prefer `run_until_parked` if you
452 /// don't need to jump in at a specific time).
453 pub async fn condition<T: 'static>(
454 &mut self,
455 model: &Model<T>,
456 mut predicate: impl FnMut(&mut T, &mut ModelContext<T>) -> bool,
457 ) {
458 let timer = self.executor().timer(Duration::from_secs(3));
459 let mut notifications = self.notifications(model);
460
461 use futures::FutureExt as _;
462 use smol::future::FutureExt as _;
463
464 async {
465 loop {
466 if model.update(self, &mut predicate) {
467 return Ok(());
468 }
469
470 if notifications.next().await.is_none() {
471 bail!("model dropped")
472 }
473 }
474 }
475 .race(timer.map(|_| Err(anyhow!("condition timed out"))))
476 .await
477 .unwrap();
478 }
479}
480
481impl<T: 'static> Model<T> {
482 /// Block until the next event is emitted by the model, then return it.
483 pub fn next_event<Event>(&self, cx: &mut TestAppContext) -> impl Future<Output = Event>
484 where
485 Event: Send + Clone + 'static,
486 T: EventEmitter<Event>,
487 {
488 let (tx, mut rx) = oneshot::channel();
489 let mut tx = Some(tx);
490 let subscription = self.update(cx, |_, cx| {
491 cx.subscribe(self, move |_, _, event, _| {
492 if let Some(tx) = tx.take() {
493 _ = tx.send(event.clone());
494 }
495 })
496 });
497
498 async move {
499 let event = rx.await.expect("no event emitted");
500 drop(subscription);
501 event
502 }
503 }
504
505 /// Returns a future that resolves when the model notifies.
506 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
507 use postage::prelude::{Sink as _, Stream as _};
508
509 let (mut tx, mut rx) = postage::mpsc::channel(1);
510 let mut cx = cx.app.app.borrow_mut();
511 let subscription = cx.observe(self, move |_, _| {
512 tx.try_send(()).ok();
513 });
514
515 let duration = if std::env::var("CI").is_ok() {
516 Duration::from_secs(5)
517 } else {
518 Duration::from_secs(1)
519 };
520
521 async move {
522 let notification = crate::util::timeout(duration, rx.recv())
523 .await
524 .expect("next notification timed out");
525 drop(subscription);
526 notification.expect("model dropped while test was waiting for its next notification")
527 }
528 }
529}
530
531impl<V: 'static> View<V> {
532 /// Returns a future that resolves when the view is next updated.
533 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
534 use postage::prelude::{Sink as _, Stream as _};
535
536 let (mut tx, mut rx) = postage::mpsc::channel(1);
537 let mut cx = cx.app.app.borrow_mut();
538 let subscription = cx.observe(self, move |_, _| {
539 tx.try_send(()).ok();
540 });
541
542 let duration = if std::env::var("CI").is_ok() {
543 Duration::from_secs(5)
544 } else {
545 Duration::from_secs(1)
546 };
547
548 async move {
549 let notification = crate::util::timeout(duration, rx.recv())
550 .await
551 .expect("next notification timed out");
552 drop(subscription);
553 notification.expect("model dropped while test was waiting for its next notification")
554 }
555 }
556}
557
558impl<V> View<V> {
559 /// Returns a future that resolves when the condition becomes true.
560 pub fn condition<Evt>(
561 &self,
562 cx: &TestAppContext,
563 mut predicate: impl FnMut(&V, &AppContext) -> bool,
564 ) -> impl Future<Output = ()>
565 where
566 Evt: 'static,
567 V: EventEmitter<Evt>,
568 {
569 use postage::prelude::{Sink as _, Stream as _};
570
571 let (tx, mut rx) = postage::mpsc::channel(1024);
572 let timeout_duration = Duration::from_millis(100);
573
574 let mut cx = cx.app.borrow_mut();
575 let subscriptions = (
576 cx.observe(self, {
577 let mut tx = tx.clone();
578 move |_, _| {
579 tx.blocking_send(()).ok();
580 }
581 }),
582 cx.subscribe(self, {
583 let mut tx = tx.clone();
584 move |_, _: &Evt, _| {
585 tx.blocking_send(()).ok();
586 }
587 }),
588 );
589
590 let cx = cx.this.upgrade().unwrap();
591 let handle = self.downgrade();
592
593 async move {
594 crate::util::timeout(timeout_duration, async move {
595 loop {
596 {
597 let cx = cx.borrow();
598 let cx = &*cx;
599 if predicate(
600 handle
601 .upgrade()
602 .expect("view dropped with pending condition")
603 .read(cx),
604 cx,
605 ) {
606 break;
607 }
608 }
609
610 cx.borrow().background_executor().start_waiting();
611 rx.recv()
612 .await
613 .expect("view dropped with pending condition");
614 cx.borrow().background_executor().finish_waiting();
615 }
616 })
617 .await
618 .expect("condition timed out");
619 drop(subscriptions);
620 }
621 }
622}
623
624use derive_more::{Deref, DerefMut};
625#[derive(Deref, DerefMut, Clone)]
626/// A VisualTestContext is the test-equivalent of a `WindowContext`. It allows you to
627/// run window-specific test code.
628pub struct VisualTestContext {
629 #[deref]
630 #[deref_mut]
631 /// cx is the original TestAppContext (you can more easily access this using Deref)
632 pub cx: TestAppContext,
633 window: AnyWindowHandle,
634}
635
636impl VisualTestContext {
637 /// Get the underlying window handle underlying this context.
638 pub fn handle(&self) -> AnyWindowHandle {
639 self.window
640 }
641
642 /// Provides the `WindowContext` for the duration of the closure.
643 pub fn update<R>(&mut self, f: impl FnOnce(&mut WindowContext) -> R) -> R {
644 self.cx.update_window(self.window, |_, cx| f(cx)).unwrap()
645 }
646
647 /// Creates a new VisualTestContext. You would typically shadow the passed in
648 /// TestAppContext with this, as this is typically more useful.
649 /// `let cx = VisualTestContext::from_window(window, cx);`
650 pub fn from_window(window: AnyWindowHandle, cx: &TestAppContext) -> Self {
651 Self {
652 cx: cx.clone(),
653 window,
654 }
655 }
656
657 /// Wait until there are no more pending tasks.
658 pub fn run_until_parked(&self) {
659 self.cx.background_executor.run_until_parked();
660 }
661
662 /// Dispatch the action to the currently focused node.
663 pub fn dispatch_action<A>(&mut self, action: A)
664 where
665 A: Action,
666 {
667 self.cx.dispatch_action(self.window, action)
668 }
669
670 /// Read the title off the window (set by `WindowContext#set_window_title`)
671 pub fn window_title(&mut self) -> Option<String> {
672 self.cx.test_window(self.window).0.lock().title.clone()
673 }
674
675 /// Simulate a sequence of keystrokes `cx.simulate_keystrokes("cmd-p escape")`
676 /// Automatically runs until parked.
677 pub fn simulate_keystrokes(&mut self, keystrokes: &str) {
678 self.cx.simulate_keystrokes(self.window, keystrokes)
679 }
680
681 /// Simulate typing text `cx.simulate_input("hello")`
682 /// Automatically runs until parked.
683 pub fn simulate_input(&mut self, input: &str) {
684 self.cx.simulate_input(self.window, input)
685 }
686
687 /// Simulate a mouse move event to the given point
688 pub fn simulate_mouse_move(&mut self, position: Point<Pixels>, modifiers: Modifiers) {
689 self.simulate_event(MouseMoveEvent {
690 position,
691 modifiers,
692 pressed_button: None,
693 })
694 }
695
696 /// Simulate a primary mouse click at the given point
697 pub fn simulate_click(&mut self, position: Point<Pixels>, modifiers: Modifiers) {
698 self.simulate_event(MouseDownEvent {
699 position,
700 modifiers,
701 button: MouseButton::Left,
702 click_count: 1,
703 first_mouse: false,
704 });
705 self.simulate_event(MouseUpEvent {
706 position,
707 modifiers,
708 button: MouseButton::Left,
709 click_count: 1,
710 });
711 }
712
713 /// Simulate a modifiers changed event
714 pub fn simulate_modifiers_change(&mut self, modifiers: Modifiers) {
715 self.simulate_event(ModifiersChangedEvent { modifiers })
716 }
717
718 /// Simulates the user resizing the window to the new size.
719 pub fn simulate_resize(&self, size: Size<Pixels>) {
720 self.simulate_window_resize(self.window, size)
721 }
722
723 /// debug_bounds returns the bounds of the element with the given selector.
724 pub fn debug_bounds(&mut self, selector: &'static str) -> Option<Bounds<Pixels>> {
725 self.update(|cx| cx.window.rendered_frame.debug_bounds.get(selector).copied())
726 }
727
728 /// Draw an element to the window. Useful for simulating events or actions
729 pub fn draw<E>(
730 &mut self,
731 origin: Point<Pixels>,
732 space: impl Into<Size<AvailableSpace>>,
733 f: impl FnOnce(&mut WindowContext) -> E,
734 ) -> (E::RequestLayoutState, E::PrepaintState)
735 where
736 E: Element,
737 {
738 self.update(|cx| {
739 cx.window.draw_phase = DrawPhase::Prepaint;
740 let mut element = Drawable::new(f(cx));
741 element.layout_as_root(space.into(), cx);
742 cx.with_absolute_element_offset(origin, |cx| element.prepaint(cx));
743
744 cx.window.draw_phase = DrawPhase::Paint;
745 let (request_layout_state, prepaint_state) = element.paint(cx);
746
747 cx.window.draw_phase = DrawPhase::None;
748 cx.refresh();
749
750 (request_layout_state, prepaint_state)
751 })
752 }
753
754 /// Simulate an event from the platform, e.g. a SrollWheelEvent
755 /// Make sure you've called [VisualTestContext::draw] first!
756 pub fn simulate_event<E: InputEvent>(&mut self, event: E) {
757 self.test_window(self.window)
758 .simulate_input(event.to_platform_input());
759 self.background_executor.run_until_parked();
760 }
761
762 /// Simulates the user blurring the window.
763 pub fn deactivate_window(&mut self) {
764 if Some(self.window) == self.test_platform.active_window() {
765 self.test_platform.set_active_window(None)
766 }
767 self.background_executor.run_until_parked();
768 }
769
770 /// Simulates the user closing the window.
771 /// Returns true if the window was closed.
772 pub fn simulate_close(&mut self) -> bool {
773 let handler = self
774 .cx
775 .update_window(self.window, |_, cx| {
776 cx.window
777 .platform_window
778 .as_test()
779 .unwrap()
780 .0
781 .lock()
782 .should_close_handler
783 .take()
784 })
785 .unwrap();
786 if let Some(mut handler) = handler {
787 let should_close = handler();
788 self.cx
789 .update_window(self.window, |_, cx| {
790 cx.window.platform_window.on_should_close(handler);
791 })
792 .unwrap();
793 should_close
794 } else {
795 false
796 }
797 }
798
799 /// Get an &mut VisualTestContext (which is mostly what you need to pass to other methods).
800 /// This method internally retains the VisualTestContext until the end of the test.
801 pub fn as_mut(self) -> &'static mut Self {
802 let ptr = Box::into_raw(Box::new(self));
803 // safety: on_quit will be called after the test has finished.
804 // the executor will ensure that all tasks related to the test have stopped.
805 // so there is no way for cx to be accessed after on_quit is called.
806 let cx = Box::leak(unsafe { Box::from_raw(ptr) });
807 cx.on_quit(move || unsafe {
808 drop(Box::from_raw(ptr));
809 });
810 cx
811 }
812}
813
814impl Context for VisualTestContext {
815 type Result<T> = <TestAppContext as Context>::Result<T>;
816
817 fn new_model<T: 'static>(
818 &mut self,
819 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
820 ) -> Self::Result<Model<T>> {
821 self.cx.new_model(build_model)
822 }
823
824 fn reserve_model<T: 'static>(&mut self) -> Self::Result<crate::Reservation<T>> {
825 self.cx.reserve_model()
826 }
827
828 fn insert_model<T: 'static>(
829 &mut self,
830 reservation: crate::Reservation<T>,
831 build_model: impl FnOnce(&mut ModelContext<'_, T>) -> T,
832 ) -> Self::Result<Model<T>> {
833 self.cx.insert_model(reservation, build_model)
834 }
835
836 fn update_model<T, R>(
837 &mut self,
838 handle: &Model<T>,
839 update: impl FnOnce(&mut T, &mut ModelContext<'_, T>) -> R,
840 ) -> Self::Result<R>
841 where
842 T: 'static,
843 {
844 self.cx.update_model(handle, update)
845 }
846
847 fn read_model<T, R>(
848 &self,
849 handle: &Model<T>,
850 read: impl FnOnce(&T, &AppContext) -> R,
851 ) -> Self::Result<R>
852 where
853 T: 'static,
854 {
855 self.cx.read_model(handle, read)
856 }
857
858 fn update_window<T, F>(&mut self, window: AnyWindowHandle, f: F) -> Result<T>
859 where
860 F: FnOnce(AnyView, &mut WindowContext<'_>) -> T,
861 {
862 self.cx.update_window(window, f)
863 }
864
865 fn read_window<T, R>(
866 &self,
867 window: &WindowHandle<T>,
868 read: impl FnOnce(View<T>, &AppContext) -> R,
869 ) -> Result<R>
870 where
871 T: 'static,
872 {
873 self.cx.read_window(window, read)
874 }
875}
876
877impl VisualContext for VisualTestContext {
878 fn new_view<V>(
879 &mut self,
880 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
881 ) -> Self::Result<View<V>>
882 where
883 V: 'static + Render,
884 {
885 self.window
886 .update(&mut self.cx, |_, cx| cx.new_view(build_view))
887 .unwrap()
888 }
889
890 fn update_view<V: 'static, R>(
891 &mut self,
892 view: &View<V>,
893 update: impl FnOnce(&mut V, &mut ViewContext<'_, V>) -> R,
894 ) -> Self::Result<R> {
895 self.window
896 .update(&mut self.cx, |_, cx| cx.update_view(view, update))
897 .unwrap()
898 }
899
900 fn replace_root_view<V>(
901 &mut self,
902 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
903 ) -> Self::Result<View<V>>
904 where
905 V: 'static + Render,
906 {
907 self.window
908 .update(&mut self.cx, |_, cx| cx.replace_root_view(build_view))
909 .unwrap()
910 }
911
912 fn focus_view<V: crate::FocusableView>(&mut self, view: &View<V>) -> Self::Result<()> {
913 self.window
914 .update(&mut self.cx, |_, cx| {
915 view.read(cx).focus_handle(cx).clone().focus(cx)
916 })
917 .unwrap()
918 }
919
920 fn dismiss_view<V>(&mut self, view: &View<V>) -> Self::Result<()>
921 where
922 V: crate::ManagedView,
923 {
924 self.window
925 .update(&mut self.cx, |_, cx| {
926 view.update(cx, |_, cx| cx.emit(crate::DismissEvent))
927 })
928 .unwrap()
929 }
930}
931
932impl AnyWindowHandle {
933 /// Creates the given view in this window.
934 pub fn build_view<V: Render + 'static>(
935 &self,
936 cx: &mut TestAppContext,
937 build_view: impl FnOnce(&mut ViewContext<'_, V>) -> V,
938 ) -> View<V> {
939 self.update(cx, |_, cx| cx.new_view(build_view)).unwrap()
940 }
941}