packages/camera/camera_avfoundation/example/ios/RunnerTests/CameraCaptureSessionQueueRaceConditionTests.m

// Copyright 2013 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 camera_avfoundation;
@import camera_avfoundation.Test;
@import XCTest;

@interface CameraCaptureSessionQueueRaceConditionTests : XCTestCase
@end

@implementation CameraCaptureSessionQueueRaceConditionTests

- (void)testFixForCaptureSessionQueueNullPointerCrashDueToRaceCondition {
  CameraPlugin *camera = [[CameraPlugin alloc] initWithRegistry:nil messenger:nil];

  XCTestExpectation *disposeExpectation =
      [self expectationWithDescription:@"dispose's result block must be called"];
  XCTestExpectation *createExpectation =
      [self expectationWithDescription:@"create's result block must be called"];
  // Mimic a dispose call followed by a create call, which can be triggered by slightly dragging the
  // home bar, causing the app to be inactive, and immediately regain active.
  [camera disposeCamera:0
             completion:^(FlutterError *_Nullable error) {
               [disposeExpectation fulfill];
             }];
  [camera createCameraOnSessionQueueWithName:@"acamera"
                                    settings:[FCPPlatformMediaSettings
                                                 makeWithResolutionPreset:
                                                     FCPPlatformResolutionPresetMedium
                                                          framesPerSecond:nil
                                                             videoBitrate:nil
                                                             audioBitrate:nil
                                                              enableAudio:YES]
                                  completion:^(NSNumber *_Nullable result,
                                               FlutterError *_Nullable error) {
                                    [createExpectation fulfill];
                                  }];
  [self waitForExpectationsWithTimeout:30 handler:nil];
  // `captureSessionQueue` must not be nil after `create` call. Otherwise a nil
  // `captureSessionQueue` passed into `AVCaptureVideoDataOutput::setSampleBufferDelegate:queue:`
  // API will cause a crash.
  XCTAssertNotNil(camera.captureSessionQueue,
                  @"captureSessionQueue must not be nil after create method. ");
}

@end