testing/scenario_app/ios/Scenarios/ScenariosUITests/iPadGestureTests.m - mirrors/engine - Git at Google

 // Copyright 2020 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #import <XCTest/XCTest.h>

 static const NSInteger kSecondsToWaitForFlutterView = 30;

 @interface iPadGestureTests : XCTestCase

 @end

 @implementation iPadGestureTests

 - (void)setUp {
   [super setUp];
   self.continueAfterFailure = NO;
 }

 static BOOL performBoolSelector(id target, SEL selector) {
   NSInvocation* invocation = [NSInvocation
       invocationWithMethodSignature:[[target class] instanceMethodSignatureForSelector:selector]];
   [invocation setSelector:selector];
   [invocation setTarget:target];
   [invocation invoke];
   BOOL returnValue;
   [invocation getReturnValue:&returnValue];
   return returnValue;
 }

 static int assertOneMessageAndGetSequenceNumber(NSMutableDictionary* messages, NSString* message) {
   NSMutableArray<NSNumber*>* matchingMessages = messages[message];
   XCTAssertNotNil(matchingMessages, @"Did not receive \"%@\" message", message);
   XCTAssertEqual(matchingMessages.count, 1, @"More than one \"%@\" message", message);
   return matchingMessages.firstObject.intValue;
 }

 // TODO(85810): Remove reflection in this test when Xcode version is upgraded to 13.
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wundeclared-selector"
 #pragma clang diagnostic ignored "-Warc-performSelector-leaks"
 - (void)testPointerButtons {
   BOOL supportsPointerInteraction = NO;
   SEL supportsPointerInteractionSelector = @selector(supportsPointerInteraction);
   if ([XCUIDevice.sharedDevice respondsToSelector:supportsPointerInteractionSelector]) {
     supportsPointerInteraction =
         performBoolSelector(XCUIDevice.sharedDevice, supportsPointerInteractionSelector);
   }
   XCTSkipUnless(supportsPointerInteraction, "Device does not support pointer interaction.");
   XCUIApplication* app = [[XCUIApplication alloc] init];
   app.launchArguments = @[ @"--pointer-events" ];
   [app launch];

   NSPredicate* predicateToFindFlutterView =
       [NSPredicate predicateWithFormat:@"identifier BEGINSWITH 'flutter_view'"];
   XCUIElement* flutterView = [[app descendantsMatchingType:XCUIElementTypeAny]
       elementMatchingPredicate:predicateToFindFlutterView];
   if (![flutterView waitForExistenceWithTimeout:kSecondsToWaitForFlutterView]) {
     NSLog(@"%@", app.debugDescription);
     XCTFail(@"Failed due to not able to find any flutterView with %@ seconds",
             @(kSecondsToWaitForFlutterView));
   }

   XCTAssertNotNil(flutterView);

   [flutterView tap];
   // Initial add event should have buttons = 0
   XCTAssertTrue(
       [app.textFields[@"0,PointerChange.add,device=0,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.add event did not occur for a normal tap");
   // Normal tap should have buttons = 0, the flutter framework will ensure it has buttons = 1
   XCTAssertTrue(
       [app.textFields[@"1,PointerChange.down,device=0,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.down event did not occur for a normal tap");
   XCTAssertTrue(
       [app.textFields[@"2,PointerChange.up,device=0,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.up event did not occur for a normal tap");
   XCTAssertTrue(
       [app.textFields[@"3,PointerChange.remove,device=0,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.remove event did not occur for a normal tap");
   SEL rightClick = @selector(rightClick);
   XCTAssertTrue([flutterView respondsToSelector:rightClick],
                 @"If supportsPointerInteraction is true, this should be true too.");
   [flutterView performSelector:rightClick];
   // On simulated right click, a hover also occurs, so the hover pointer is added
   XCTAssertTrue(
       [app.textFields[@"4,PointerChange.add,device=1,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.add event did not occur for a right-click's hover pointer");

   // The hover pointer is removed after ~3.5 seconds, this ensures that all events are received
   XCTestExpectation* sleepExpectation = [self expectationWithDescription:@"never fires"];
   sleepExpectation.inverted = true;
   [self waitForExpectations:@[ sleepExpectation ] timeout:5.0];

   // The hover events are interspersed with the right-click events in a varying order.
   // Ensure the individual orderings are respected without hardcoding the absolute sequence.
   NSMutableDictionary<NSString*, NSMutableArray<NSNumber*>*>* messages =
       [[NSMutableDictionary alloc] init];
   for (XCUIElement* element in [app.textFields allElementsBoundByIndex]) {
     NSString* rawMessage = element.value;
     // Parse out the sequence number
     NSUInteger commaIndex = [rawMessage rangeOfString:@","].location;
     NSInteger messageSequenceNumber =
         [rawMessage substringWithRange:NSMakeRange(0, commaIndex)].integerValue;
     // Parse out the rest of the message
     NSString* message = [rawMessage
         substringWithRange:NSMakeRange(commaIndex + 1, rawMessage.length - (commaIndex + 1))];
     NSMutableArray<NSNumber*>* messageSequenceNumberList = messages[message];
     if (messageSequenceNumberList == nil) {
       messageSequenceNumberList = [[NSMutableArray alloc] init];
       messages[message] = messageSequenceNumberList;
     }
     [messageSequenceNumberList addObject:@(messageSequenceNumber)];
   }
   // The number of hover events is not consistent, there could be one or many.
   NSMutableArray<NSNumber*>* hoverSequenceNumbers =
       messages[@"PointerChange.hover,device=1,buttons=0"];
   int hoverRemovedSequenceNumber =
       assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.remove,device=1,buttons=0");
   // Right click should have buttons = 2
   int rightClickAddedSequenceNumber;
   int rightClickDownSequenceNumber;
   int rightClickUpSequenceNumber;
   if (messages[@"PointerChange.add,device=2,buttons=0"] == nil) {
     // Sometimes the tap pointer has the same device as the right-click (the UITouch is reused)
     rightClickAddedSequenceNumber = 0;
     rightClickDownSequenceNumber =
         assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.down,device=0,buttons=2");
     rightClickUpSequenceNumber =
         assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.up,device=0,buttons=2");
   } else {
     rightClickAddedSequenceNumber =
         assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.add,device=2,buttons=0");
     rightClickDownSequenceNumber =
         assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.down,device=2,buttons=2");
     rightClickUpSequenceNumber =
         assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.up,device=2,buttons=2");
   }
   XCTAssertGreaterThan(rightClickDownSequenceNumber, rightClickAddedSequenceNumber,
                        @"Right-click pointer was pressed before it was added");
   XCTAssertGreaterThan(rightClickUpSequenceNumber, rightClickDownSequenceNumber,
                        @"Right-click pointer was released before it was pressed");
   XCTAssertGreaterThan([[hoverSequenceNumbers firstObject] intValue], 4,
                        @"Hover occured before hover pointer was added");
   XCTAssertGreaterThan(hoverRemovedSequenceNumber, [[hoverSequenceNumbers lastObject] intValue],
                        @"Hover occured after hover pointer was removed");
 }

 - (void)testPointerHover {
   BOOL supportsPointerInteraction = NO;
   SEL supportsPointerInteractionSelector = @selector(supportsPointerInteraction);
   if ([XCUIDevice.sharedDevice respondsToSelector:supportsPointerInteractionSelector]) {
     supportsPointerInteraction =
         performBoolSelector(XCUIDevice.sharedDevice, supportsPointerInteractionSelector);
   }
   XCTSkipUnless(supportsPointerInteraction, "Device does not support pointer interaction.");
   XCUIApplication* app = [[XCUIApplication alloc] init];
   app.launchArguments = @[ @"--pointer-events" ];
   [app launch];

   NSPredicate* predicateToFindFlutterView =
       [NSPredicate predicateWithFormat:@"identifier BEGINSWITH 'flutter_view'"];
   XCUIElement* flutterView = [[app descendantsMatchingType:XCUIElementTypeAny]
       elementMatchingPredicate:predicateToFindFlutterView];
   if (![flutterView waitForExistenceWithTimeout:kSecondsToWaitForFlutterView]) {
     NSLog(@"%@", app.debugDescription);
     XCTFail(@"Failed due to not able to find any flutterView with %@ seconds",
             @(kSecondsToWaitForFlutterView));
   }

   XCTAssertNotNil(flutterView);

   SEL hover = @selector(hover);
   XCTAssertTrue([flutterView respondsToSelector:hover],
                 @"If supportsPointerInteraction is true, this should be true too.");
   [flutterView performSelector:hover];
   XCTAssertTrue(
       [app.textFields[@"0,PointerChange.add,device=0,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.add event did not occur for a hover");
   XCTAssertTrue(
       [app.textFields[@"1,PointerChange.hover,device=0,buttons=0"] waitForExistenceWithTimeout:1],
       @"PointerChange.hover event did not occur for a hover");
   // The number of hover events fired is not always the same
   NSInteger lastHoverSequenceNumber = -1;
   NSPredicate* predicateToFindHoverEvents =
       [NSPredicate predicateWithFormat:@"value ENDSWITH ',PointerChange.hover,device=0,buttons=0'"];
   for (XCUIElement* textField in
        [[app.textFields matchingPredicate:predicateToFindHoverEvents] allElementsBoundByIndex]) {
     NSInteger messageSequenceNumber =
         [[textField.value componentsSeparatedByString:@","] firstObject].integerValue;
     if (messageSequenceNumber > lastHoverSequenceNumber) {
       lastHoverSequenceNumber = messageSequenceNumber;
     }
   }
   XCTAssertNotEqual(lastHoverSequenceNumber, -1,
                     @"PointerChange.hover event did not occur for a hover");
   NSString* removeMessage = [NSString
       stringWithFormat:@"%ld,PointerChange.remove,device=0,buttons=0", lastHoverSequenceNumber + 1];
   XCTAssertTrue([app.textFields[removeMessage] waitForExistenceWithTimeout:1],
                 @"PointerChange.remove event did not occur for a hover");
 }

 - (void)testPointerScroll {
   BOOL supportsPointerInteraction = NO;
   SEL supportsPointerInteractionSelector = @selector(supportsPointerInteraction);
   if ([XCUIDevice.sharedDevice respondsToSelector:supportsPointerInteractionSelector]) {
     supportsPointerInteraction =
         performBoolSelector(XCUIDevice.sharedDevice, supportsPointerInteractionSelector);
   }
   XCTSkipUnless(supportsPointerInteraction, "Device does not support pointer interaction.");
   XCUIApplication* app = [[XCUIApplication alloc] init];
   app.launchArguments = @[ @"--pointer-events" ];
   [app launch];

   NSPredicate* predicateToFindFlutterView =
       [NSPredicate predicateWithFormat:@"identifier BEGINSWITH 'flutter_view'"];
   XCUIElement* flutterView = [[app descendantsMatchingType:XCUIElementTypeAny]
       elementMatchingPredicate:predicateToFindFlutterView];
   if (![flutterView waitForExistenceWithTimeout:kSecondsToWaitForFlutterView]) {
     XCTFail(@"Failed due to not able to find any flutterView with %@ seconds",
             @(kSecondsToWaitForFlutterView));
   }

   XCTAssertNotNil(flutterView);

   SEL scroll = @selector(scrollByDeltaX:deltaY:);
   XCTAssertTrue([flutterView respondsToSelector:scroll],
                 @"If supportsPointerInteraction is true, this should be true too.");
   // Need to use NSInvocation in order to send primitive arguments to selector.
   NSInvocation* invocation = [NSInvocation
       invocationWithMethodSignature:[XCUIElement instanceMethodSignatureForSelector:scroll]];
   [invocation setSelector:scroll];
   CGFloat deltaX = 0.0;
   CGFloat deltaY = 1000.0;
   [invocation setArgument:&deltaX atIndex:2];
   [invocation setArgument:&deltaY atIndex:3];
   [invocation invokeWithTarget:flutterView];

   // Hover immediately following the scroll to cause an inertia cancel event.
   SEL hover = @selector(hover:);
   XCTAssertTrue([flutterView respondsToSelector:hover],
                 @"If supportsPointerInteraction is true, this should be true too.");
   [flutterView performSelector:hover];

   // The hover pointer is observed to be removed by the system after ~3.5 seconds of inactivity.
   // While this is not a documented behavior, it is the only way to test for the removal of the
   // hover pointer. Waiting for 5 seconds will ensure that all events are received before
   // processing.
   XCTestExpectation* sleepExpectation = [self expectationWithDescription:@"never fires"];
   sleepExpectation.inverted = true;
   [self waitForExpectations:@[ sleepExpectation ] timeout:5.0];

   // There are hover events interspersed with the scroll events in a varying order.
   // Ensure the individual orderings are respected without hardcoding the absolute sequence.
   NSMutableDictionary<NSString*, NSMutableArray<NSNumber*>*>* messages =
       [[NSMutableDictionary alloc] init];
   for (XCUIElement* element in [app.textFields allElementsBoundByIndex]) {
     NSString* rawMessage = element.value;
     // Parse out the sequence number
     NSUInteger commaIndex = [rawMessage rangeOfString:@","].location;
     NSInteger messageSequenceNumber =
         [rawMessage substringWithRange:NSMakeRange(0, commaIndex)].integerValue;
     // Parse out the rest of the message
     NSString* message = [rawMessage
         substringWithRange:NSMakeRange(commaIndex + 1, rawMessage.length - (commaIndex + 1))];
     NSMutableArray<NSNumber*>* messageSequenceNumberList = messages[message];
     if (messageSequenceNumberList == nil) {
       messageSequenceNumberList = [[NSMutableArray alloc] init];
       messages[message] = messageSequenceNumberList;
     }
     [messageSequenceNumberList addObject:@(messageSequenceNumber)];
   }
   // The number of hover events is not consistent, there could be one or many.
   int hoverAddedSequenceNumber = assertOneMessageAndGetSequenceNumber(
       messages, @"PointerChange.add,device=0,buttons=0,signalKind=PointerSignalKind.none");
   NSMutableArray<NSNumber*>* hoverSequenceNumbers =
       messages[@"PointerChange.hover,device=0,buttons=0,signalKind=PointerSignalKind.none"];
   int hoverRemovedSequenceNumber = assertOneMessageAndGetSequenceNumber(
       messages, @"PointerChange.remove,device=0,buttons=0,signalKind=PointerSignalKind.none");
   int panZoomAddedSequenceNumber = assertOneMessageAndGetSequenceNumber(
       messages, @"PointerChange.add,device=1,buttons=0,signalKind=PointerSignalKind.none");
   int panZoomStartSequenceNumber = assertOneMessageAndGetSequenceNumber(
       messages, @"PointerChange.panZoomStart,device=1,buttons=0,signalKind=PointerSignalKind.none");
   // The number of pan/zoom update events is not consistent, there could be one or many.
   NSMutableArray<NSNumber*>* panZoomUpdateSequenceNumbers =
       messages[@"PointerChange.panZoomUpdate,device=1,buttons=0,signalKind=PointerSignalKind.none"];
   int panZoomEndSequenceNumber = assertOneMessageAndGetSequenceNumber(
       messages, @"PointerChange.panZoomEnd,device=1,buttons=0,signalKind=PointerSignalKind.none");
   int inertiaCancelSequenceNumber = assertOneMessageAndGetSequenceNumber(
       messages,
       @"PointerChange.cancel,device=2,buttons=0,signalKind=PointerSignalKind.scrollInertiaCancel");

   XCTAssertGreaterThan(panZoomStartSequenceNumber, panZoomAddedSequenceNumber,
                        @"PanZoomStart occured before pointer was added");
   XCTAssertGreaterThan([[panZoomUpdateSequenceNumbers firstObject] intValue],
                        panZoomStartSequenceNumber, @"PanZoomUpdate occured before PanZoomStart");
   XCTAssertGreaterThan(panZoomEndSequenceNumber,
                        [[panZoomUpdateSequenceNumbers lastObject] intValue],
                        @"PanZoomUpdate occured after PanZoomEnd");
   XCTAssertGreaterThan(inertiaCancelSequenceNumber, panZoomEndSequenceNumber,
                        @"ScrollInertiaCancel occured before PanZoomEnd");

   XCTAssertGreaterThan([[hoverSequenceNumbers firstObject] intValue], hoverAddedSequenceNumber,
                        @"Hover occured before pointer was added");
   XCTAssertGreaterThan(hoverRemovedSequenceNumber, [[hoverSequenceNumbers lastObject] intValue],
                        @"Hover occured after pointer was removed");
 }
 #pragma clang diagnostic pop

 @end
	// Copyright 2020 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#import <XCTest/XCTest.h>

	static const NSInteger kSecondsToWaitForFlutterView = 30;

	@interface iPadGestureTests : XCTestCase

	@end

	@implementation iPadGestureTests

	- (void)setUp {
	[super setUp];
	self.continueAfterFailure = NO;
	}

	static BOOL performBoolSelector(id target, SEL selector) {
	NSInvocation* invocation = [NSInvocation
	invocationWithMethodSignature:[[target class] instanceMethodSignatureForSelector:selector]];
	[invocation setSelector:selector];
	[invocation setTarget:target];
	[invocation invoke];
	BOOL returnValue;
	[invocation getReturnValue:&returnValue];
	return returnValue;
	}

	static int assertOneMessageAndGetSequenceNumber(NSMutableDictionary* messages, NSString* message) {
	NSMutableArray<NSNumber> matchingMessages = messages[message];
	XCTAssertNotNil(matchingMessages, @"Did not receive \"%@\" message", message);
	XCTAssertEqual(matchingMessages.count, 1, @"More than one \"%@\" message", message);
	return matchingMessages.firstObject.intValue;
	}

	// TODO(85810): Remove reflection in this test when Xcode version is upgraded to 13.
	#pragma clang diagnostic push
	#pragma clang diagnostic ignored "-Wundeclared-selector"
	#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
	- (void)testPointerButtons {
	BOOL supportsPointerInteraction = NO;
	SEL supportsPointerInteractionSelector = @selector(supportsPointerInteraction);
	if ([XCUIDevice.sharedDevice respondsToSelector:supportsPointerInteractionSelector]) {
	supportsPointerInteraction =
	performBoolSelector(XCUIDevice.sharedDevice, supportsPointerInteractionSelector);
	}
	XCTSkipUnless(supportsPointerInteraction, "Device does not support pointer interaction.");
	XCUIApplication* app = [[XCUIApplication alloc] init];
	app.launchArguments = @[ @"--pointer-events" ];
	[app launch];

	NSPredicate* predicateToFindFlutterView =
	[NSPredicate predicateWithFormat:@"identifier BEGINSWITH 'flutter_view'"];
	XCUIElement* flutterView = [[app descendantsMatchingType:XCUIElementTypeAny]
	elementMatchingPredicate:predicateToFindFlutterView];
	if (![flutterView waitForExistenceWithTimeout:kSecondsToWaitForFlutterView]) {
	NSLog(@"%@", app.debugDescription);
	XCTFail(@"Failed due to not able to find any flutterView with %@ seconds",
	@(kSecondsToWaitForFlutterView));
	}

	XCTAssertNotNil(flutterView);

	[flutterView tap];
	// Initial add event should have buttons = 0
	XCTAssertTrue(
	[app.textFields[@"0,PointerChange.add,device=0,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.add event did not occur for a normal tap");
	// Normal tap should have buttons = 0, the flutter framework will ensure it has buttons = 1
	XCTAssertTrue(
	[app.textFields[@"1,PointerChange.down,device=0,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.down event did not occur for a normal tap");
	XCTAssertTrue(
	[app.textFields[@"2,PointerChange.up,device=0,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.up event did not occur for a normal tap");
	XCTAssertTrue(
	[app.textFields[@"3,PointerChange.remove,device=0,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.remove event did not occur for a normal tap");
	SEL rightClick = @selector(rightClick);
	XCTAssertTrue([flutterView respondsToSelector:rightClick],
	@"If supportsPointerInteraction is true, this should be true too.");
	[flutterView performSelector:rightClick];
	// On simulated right click, a hover also occurs, so the hover pointer is added
	XCTAssertTrue(
	[app.textFields[@"4,PointerChange.add,device=1,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.add event did not occur for a right-click's hover pointer");

	// The hover pointer is removed after ~3.5 seconds, this ensures that all events are received
	XCTestExpectation* sleepExpectation = [self expectationWithDescription:@"never fires"];
	sleepExpectation.inverted = true;
	[self waitForExpectations:@[ sleepExpectation ] timeout:5.0];

	// The hover events are interspersed with the right-click events in a varying order.
	// Ensure the individual orderings are respected without hardcoding the absolute sequence.
	NSMutableDictionary<NSString, NSMutableArray<NSNumber>> messages =
	[[NSMutableDictionary alloc] init];
	for (XCUIElement* element in [app.textFields allElementsBoundByIndex]) {
	NSString* rawMessage = element.value;
	// Parse out the sequence number
	NSUInteger commaIndex = [rawMessage rangeOfString:@","].location;
	NSInteger messageSequenceNumber =
	[rawMessage substringWithRange:NSMakeRange(0, commaIndex)].integerValue;
	// Parse out the rest of the message
	NSString* message = [rawMessage
	substringWithRange:NSMakeRange(commaIndex + 1, rawMessage.length - (commaIndex + 1))];
	NSMutableArray<NSNumber> messageSequenceNumberList = messages[message];
	if (messageSequenceNumberList == nil) {
	messageSequenceNumberList = [[NSMutableArray alloc] init];
	messages[message] = messageSequenceNumberList;
	}
	[messageSequenceNumberList addObject:@(messageSequenceNumber)];
	}
	// The number of hover events is not consistent, there could be one or many.
	NSMutableArray<NSNumber> hoverSequenceNumbers =
	messages[@"PointerChange.hover,device=1,buttons=0"];
	int hoverRemovedSequenceNumber =
	assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.remove,device=1,buttons=0");
	// Right click should have buttons = 2
	int rightClickAddedSequenceNumber;
	int rightClickDownSequenceNumber;
	int rightClickUpSequenceNumber;
	if (messages[@"PointerChange.add,device=2,buttons=0"] == nil) {
	// Sometimes the tap pointer has the same device as the right-click (the UITouch is reused)
	rightClickAddedSequenceNumber = 0;
	rightClickDownSequenceNumber =
	assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.down,device=0,buttons=2");
	rightClickUpSequenceNumber =
	assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.up,device=0,buttons=2");
	} else {
	rightClickAddedSequenceNumber =
	assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.add,device=2,buttons=0");
	rightClickDownSequenceNumber =
	assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.down,device=2,buttons=2");
	rightClickUpSequenceNumber =
	assertOneMessageAndGetSequenceNumber(messages, @"PointerChange.up,device=2,buttons=2");
	}
	XCTAssertGreaterThan(rightClickDownSequenceNumber, rightClickAddedSequenceNumber,
	@"Right-click pointer was pressed before it was added");
	XCTAssertGreaterThan(rightClickUpSequenceNumber, rightClickDownSequenceNumber,
	@"Right-click pointer was released before it was pressed");
	XCTAssertGreaterThan([[hoverSequenceNumbers firstObject] intValue], 4,
	@"Hover occured before hover pointer was added");
	XCTAssertGreaterThan(hoverRemovedSequenceNumber, [[hoverSequenceNumbers lastObject] intValue],
	@"Hover occured after hover pointer was removed");
	}

	- (void)testPointerHover {
	BOOL supportsPointerInteraction = NO;
	SEL supportsPointerInteractionSelector = @selector(supportsPointerInteraction);
	if ([XCUIDevice.sharedDevice respondsToSelector:supportsPointerInteractionSelector]) {
	supportsPointerInteraction =
	performBoolSelector(XCUIDevice.sharedDevice, supportsPointerInteractionSelector);
	}
	XCTSkipUnless(supportsPointerInteraction, "Device does not support pointer interaction.");
	XCUIApplication* app = [[XCUIApplication alloc] init];
	app.launchArguments = @[ @"--pointer-events" ];
	[app launch];

	NSPredicate* predicateToFindFlutterView =
	[NSPredicate predicateWithFormat:@"identifier BEGINSWITH 'flutter_view'"];
	XCUIElement* flutterView = [[app descendantsMatchingType:XCUIElementTypeAny]
	elementMatchingPredicate:predicateToFindFlutterView];
	if (![flutterView waitForExistenceWithTimeout:kSecondsToWaitForFlutterView]) {
	NSLog(@"%@", app.debugDescription);
	XCTFail(@"Failed due to not able to find any flutterView with %@ seconds",
	@(kSecondsToWaitForFlutterView));
	}

	XCTAssertNotNil(flutterView);

	SEL hover = @selector(hover);
	XCTAssertTrue([flutterView respondsToSelector:hover],
	@"If supportsPointerInteraction is true, this should be true too.");
	[flutterView performSelector:hover];
	XCTAssertTrue(
	[app.textFields[@"0,PointerChange.add,device=0,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.add event did not occur for a hover");
	XCTAssertTrue(
	[app.textFields[@"1,PointerChange.hover,device=0,buttons=0"] waitForExistenceWithTimeout:1],
	@"PointerChange.hover event did not occur for a hover");
	// The number of hover events fired is not always the same
	NSInteger lastHoverSequenceNumber = -1;
	NSPredicate* predicateToFindHoverEvents =
	[NSPredicate predicateWithFormat:@"value ENDSWITH ',PointerChange.hover,device=0,buttons=0'"];
	for (XCUIElement* textField in
	[[app.textFields matchingPredicate:predicateToFindHoverEvents] allElementsBoundByIndex]) {
	NSInteger messageSequenceNumber =
	[[textField.value componentsSeparatedByString:@","] firstObject].integerValue;
	if (messageSequenceNumber > lastHoverSequenceNumber) {
	lastHoverSequenceNumber = messageSequenceNumber;
	}
	}
	XCTAssertNotEqual(lastHoverSequenceNumber, -1,
	@"PointerChange.hover event did not occur for a hover");
	NSString* removeMessage = [NSString
	stringWithFormat:@"%ld,PointerChange.remove,device=0,buttons=0", lastHoverSequenceNumber + 1];
	XCTAssertTrue([app.textFields[removeMessage] waitForExistenceWithTimeout:1],
	@"PointerChange.remove event did not occur for a hover");
	}

	- (void)testPointerScroll {
	BOOL supportsPointerInteraction = NO;
	SEL supportsPointerInteractionSelector = @selector(supportsPointerInteraction);
	if ([XCUIDevice.sharedDevice respondsToSelector:supportsPointerInteractionSelector]) {
	supportsPointerInteraction =
	performBoolSelector(XCUIDevice.sharedDevice, supportsPointerInteractionSelector);
	}
	XCTSkipUnless(supportsPointerInteraction, "Device does not support pointer interaction.");
	XCUIApplication* app = [[XCUIApplication alloc] init];
	app.launchArguments = @[ @"--pointer-events" ];
	[app launch];

	NSPredicate* predicateToFindFlutterView =
	[NSPredicate predicateWithFormat:@"identifier BEGINSWITH 'flutter_view'"];
	XCUIElement* flutterView = [[app descendantsMatchingType:XCUIElementTypeAny]
	elementMatchingPredicate:predicateToFindFlutterView];
	if (![flutterView waitForExistenceWithTimeout:kSecondsToWaitForFlutterView]) {
	XCTFail(@"Failed due to not able to find any flutterView with %@ seconds",
	@(kSecondsToWaitForFlutterView));
	}

	XCTAssertNotNil(flutterView);

	SEL scroll = @selector(scrollByDeltaX:deltaY:);
	XCTAssertTrue([flutterView respondsToSelector:scroll],
	@"If supportsPointerInteraction is true, this should be true too.");
	// Need to use NSInvocation in order to send primitive arguments to selector.
	NSInvocation* invocation = [NSInvocation
	invocationWithMethodSignature:[XCUIElement instanceMethodSignatureForSelector:scroll]];
	[invocation setSelector:scroll];
	CGFloat deltaX = 0.0;
	CGFloat deltaY = 1000.0;
	[invocation setArgument:&deltaX atIndex:2];
	[invocation setArgument:&deltaY atIndex:3];
	[invocation invokeWithTarget:flutterView];

	// Hover immediately following the scroll to cause an inertia cancel event.
	SEL hover = @selector(hover:);
	XCTAssertTrue([flutterView respondsToSelector:hover],
	@"If supportsPointerInteraction is true, this should be true too.");
	[flutterView performSelector:hover];

	// The hover pointer is observed to be removed by the system after ~3.5 seconds of inactivity.
	// While this is not a documented behavior, it is the only way to test for the removal of the
	// hover pointer. Waiting for 5 seconds will ensure that all events are received before
	// processing.
	XCTestExpectation* sleepExpectation = [self expectationWithDescription:@"never fires"];
	sleepExpectation.inverted = true;
	[self waitForExpectations:@[ sleepExpectation ] timeout:5.0];

	// There are hover events interspersed with the scroll events in a varying order.
	// Ensure the individual orderings are respected without hardcoding the absolute sequence.
	NSMutableDictionary<NSString, NSMutableArray<NSNumber>> messages =
	[[NSMutableDictionary alloc] init];
	for (XCUIElement* element in [app.textFields allElementsBoundByIndex]) {
	NSString* rawMessage = element.value;
	// Parse out the sequence number
	NSUInteger commaIndex = [rawMessage rangeOfString:@","].location;
	NSInteger messageSequenceNumber =
	[rawMessage substringWithRange:NSMakeRange(0, commaIndex)].integerValue;
	// Parse out the rest of the message
	NSString* message = [rawMessage
	substringWithRange:NSMakeRange(commaIndex + 1, rawMessage.length - (commaIndex + 1))];
	NSMutableArray<NSNumber> messageSequenceNumberList = messages[message];
	if (messageSequenceNumberList == nil) {
	messageSequenceNumberList = [[NSMutableArray alloc] init];
	messages[message] = messageSequenceNumberList;
	}
	[messageSequenceNumberList addObject:@(messageSequenceNumber)];
	}
	// The number of hover events is not consistent, there could be one or many.
	int hoverAddedSequenceNumber = assertOneMessageAndGetSequenceNumber(
	messages, @"PointerChange.add,device=0,buttons=0,signalKind=PointerSignalKind.none");
	NSMutableArray<NSNumber> hoverSequenceNumbers =
	messages[@"PointerChange.hover,device=0,buttons=0,signalKind=PointerSignalKind.none"];
	int hoverRemovedSequenceNumber = assertOneMessageAndGetSequenceNumber(
	messages, @"PointerChange.remove,device=0,buttons=0,signalKind=PointerSignalKind.none");
	int panZoomAddedSequenceNumber = assertOneMessageAndGetSequenceNumber(
	messages, @"PointerChange.add,device=1,buttons=0,signalKind=PointerSignalKind.none");
	int panZoomStartSequenceNumber = assertOneMessageAndGetSequenceNumber(
	messages, @"PointerChange.panZoomStart,device=1,buttons=0,signalKind=PointerSignalKind.none");
	// The number of pan/zoom update events is not consistent, there could be one or many.
	NSMutableArray<NSNumber> panZoomUpdateSequenceNumbers =
	messages[@"PointerChange.panZoomUpdate,device=1,buttons=0,signalKind=PointerSignalKind.none"];
	int panZoomEndSequenceNumber = assertOneMessageAndGetSequenceNumber(
	messages, @"PointerChange.panZoomEnd,device=1,buttons=0,signalKind=PointerSignalKind.none");
	int inertiaCancelSequenceNumber = assertOneMessageAndGetSequenceNumber(
	messages,
	@"PointerChange.cancel,device=2,buttons=0,signalKind=PointerSignalKind.scrollInertiaCancel");

	XCTAssertGreaterThan(panZoomStartSequenceNumber, panZoomAddedSequenceNumber,
	@"PanZoomStart occured before pointer was added");
	XCTAssertGreaterThan([[panZoomUpdateSequenceNumbers firstObject] intValue],
	panZoomStartSequenceNumber, @"PanZoomUpdate occured before PanZoomStart");
	XCTAssertGreaterThan(panZoomEndSequenceNumber,
	[[panZoomUpdateSequenceNumbers lastObject] intValue],
	@"PanZoomUpdate occured after PanZoomEnd");
	XCTAssertGreaterThan(inertiaCancelSequenceNumber, panZoomEndSequenceNumber,
	@"ScrollInertiaCancel occured before PanZoomEnd");

	XCTAssertGreaterThan([[hoverSequenceNumbers firstObject] intValue], hoverAddedSequenceNumber,
	@"Hover occured before pointer was added");
	XCTAssertGreaterThan(hoverRemovedSequenceNumber, [[hoverSequenceNumbers lastObject] intValue],
	@"Hover occured after pointer was removed");
	}
	#pragma clang diagnostic pop

	@end