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test: Improve trigger non fully blocking AppHang #4265
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| import Foundation | ||
| import UIKit | ||
|
|
||
| /// Triggers a non-fully blocking app hang by blocking the app for 0.5 seconds, | ||
| /// then allowing it to draw a couple of frames, and blocking it again. While the app | ||
| /// is not fully blocked because it renders a few frames, it still seems blocked to the | ||
| /// user and should be considered an app hang. | ||
| func triggerNonFullyBlockingAppHang() { | ||
|
|
||
| DispatchQueue.global().async { | ||
| for _ in 0...10 { | ||
| Thread.sleep(forTimeInterval: 0.001) | ||
| DispatchQueue.main.sync { | ||
| Thread.sleep(forTimeInterval: 0.5) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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||
| /// Schedules heavy UI rendering work on the main thread in a tight loop, which causes | ||
| /// a fully blocking app hang without frames being rendered. | ||
| func triggerFullyBlockingAppHang(button: UIButton) { | ||
| let buttonTitle = button.currentTitle | ||
| var i = 0 | ||
|
|
||
| for _ in 0...5_000_000 { | ||
| i += Int.random(in: 0...10) | ||
| i -= 1 | ||
|
|
||
| button.setTitle("\(i)", for: .normal) | ||
| } | ||
|
|
||
| button.setTitle(buttonTitle, for: .normal) | ||
| } | ||
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