PlatformView XCTest is flaky #70843
Description
testSetFlutterViewControllerInTheMiddleOfTouchEventShouldStillAllowGesturesToBeHandled is flaky in recent several commits.
https://ci.chromium.org/p/flutter/builders/prod/Mac%20iOS%20Engine/7804
Test Case '-[FlutterPlatformViewsTest testSetFlutterViewControllerInTheMiddleOfTouchEventShouldStillAllowGesturesToBeHandled]' started.
2020-11-18 16:07:13.965107-0800 IosUnitTests[30256:197931] +[NSSet ocmock_replaced_setWithObjects:count:]: unrecognized selector sent to class 0x1049c5fb0
2020-11-18 16:07:13.973322-0800 IosUnitTests[30256:197931] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSSet ocmock_replaced_setWithObjects:count:]: unrecognized selector sent to class 0x1049c5fb0'
*** First throw call stack:
(
0 CoreFoundation 0x00000001046f9bde __exceptionPreprocess + 350
1 libobjc.A.dylib 0x0000000103b95b20 objc_exception_throw + 48
2 CoreFoundation 0x000000010471a604 +[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00000001046fe7bc ___forwarding___ + 1436
4 CoreFoundation 0x00000001047006c8 _CF_forwarding_prep_0 + 120
5 CoreFoundation 0x000000010470095c __invoking___ + 140
6 CoreFoundation 0x00000001046fdd8f -[NSInvocation invoke] + 287
7 CoreFoundation 0x00000001046fe566 ___forwarding___ + 838
8 CoreFoundation 0x00000001047006c8 _CF_forwarding_prep_0 + 120
9 CoreFoundation 0x00000001047202f6 -[NSSet setByAddingObjectsFromSet:] + 710
10 DTXConnectionServices 0x000000011f93d0c2 -[DTXProxyChannel _allowedClassesForReturnValues] + 109
11 DTXConnectionServices 0x000000011f93d7ee __42-[DTXProxyChannel _sendInvocationMessage:]_block_invoke + 260
12 DTXConnectionServices 0x000000011f94a8d2 __51-[DTXChannel _scheduleMessage:tracker:withHandler:]_block_invoke.617 + 159
13 libdispatch.dylib 0x0000000105522888 _dispatch_call_block_and_release + 12
14 libdispatch.dylib 0x00000001055237f9 _dispatch_client_callout + 8
15 libdispatch.dylib 0x0000000105529566 _dispatch_lane_serial_drain + 707
16 libdispatch.dylib 0x0000000105529f9c _dispatch_lane_invoke + 388
17 libdispatch.dylib 0x000000010553406c _dispatch_workloop_worker_thread + 626
18 libsystem_pthread.dylib 0x00007fff5141fa3d _pthread_wqthread + 290
19 libsystem_pthread.dylib 0x00007fff5141eb77 start_wqthread + 15
)
It looks like some issue with OCMock.