XCUITest tapping-on-permission-dialog throws exceptions when test is built by Xcode 13.2.1 and run on OS older than 13.0

Number:rdar://FB9858932 Date Originated:2022-01-25
Status:Open Resolved:
Product: Product Version:
Classification: Reproducible:
Sending a tap event to a button on a system dialog throws an exception deep inside XCTest if your app is built with Xcode 13.2.1 and is run on iOS 12.x simulators.

Testing environment: built by Xcode 13.2.1 and run on iPhone SE 12.4 - failed with exceptions
Testing environment: built by Xcode 13.2.1 and run on iPhone SE 13.0 - passed

Steps to reproduce:
   * At launch, app calls [CNContactStore -requestAccessForEntityType:completionHandler:] to trigger Contact permission dialog.
   * In UI test, launch the app process, then call [[[[[XCUIApplication alloc] initWithBundleIdentifier:@"com.apple.springboard"] descendantsMatchingType:XCUIElementTypeAlert] firstMatch].buttons[@"OK"] tap].

Expected behavior: the "OK" button of the permission dialog is tapped and dismissed.

Actual Behavior: Test failed with error "-[__NSArrayM insertObject:atIndex:]: object cannot be nil (NSInvalidArgumentException)".
	0   CoreFoundation                      0x0000000101c278db __exceptionPreprocess + 331
	1   libobjc.A.dylib                     0x00000001011caac5 objc_exception_throw + 48
	2   CoreFoundation                      0x0000000101b75fac _CFThrowFormattedException + 194
	3   CoreFoundation                      0x0000000101b52cb5 -[__NSArrayM insertObject:atIndex:] + 1269
	4   XCUIAutomation                      0x0000000114d1459f __104-[XCAXClient_iOS interruptingUIElementsAffectingSnapshot:checkForHandledElement:containsHandledElement:]_block_invoke + 1362
	5   XCTestCore                          0x0000000114e6d9ad -[XCTContext _runActivityNamed:type:block:] + 245
	6   XCTestCore                          0x0000000114e6cb70 +[XCTContext runInternalActivityNamed:block:] + 244
	7   XCUIAutomation                      0x0000000114d13f8d -[XCAXClient_iOS interruptingUIElementsAffectingSnapshot:checkForHandledElement:containsHandledElement:] + 451
	8   XCUIAutomation                      0x0000000114d0069d __93-[XCUIElement(XCUIElementEventSynthesis) _allUIInterruptionsHandledForElementSnapshot:error:]_block_invoke + 115
	9   XCTAutomationSupport                0x000000011530266f +[XCTRuntimeIssueContext captureIssuesWithContext:inScope:] + 403
	10  XCUIAutomation                      0x0000000114d004b5 -[XCUIElement(XCUIElementEventSynthesis) _allUIInterruptionsHandledForElementSnapshot:error:] + 337
	11  XCUIAutomation                      0x0000000114cff26f -[XCUIElement(XCUIElementEventSynthesis) _dispatchEventWithEventBuilder:error:] + 245
	12  XCUIAutomation                      0x0000000114cff9f2 __70-[XCUIElement(XCUIElementEventSynthesis) _dispatchEvent:eventBuilder:]_block_invoke + 136
	13  XCTestCore                          0x0000000114e6d9ad -[XCTContext _runActivityNamed:type:block:] + 245
	14  XCTestCore                          0x0000000114e6cb70 +[XCTContext runInternalActivityNamed:block:] + 244
	15  XCUIAutomation                      0x0000000114cff891 -[XCUIElement(XCUIElementEventSynthesis) _dispatchEvent:eventBuilder:] + 242
	16  XCUIAutomation                      0x0000000114d030d8 -[XCUIElement(XCUIElementTouchEvents) tap] + 435


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