firebase-ios-sdk/GoogleDataTransport/GDTCORTests/Unit/GDTCORStorageTest.m

/*
 * Copyright 2018 Google
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "GDTCORTests/Unit/GDTCORTestCase.h"

#import "GDTCORLibrary/Private/GDTCORRegistrar_Private.h"
#import "GDTCORLibrary/Private/GDTCORStorage.h"
#import "GDTCORLibrary/Private/GDTCORStorage_Private.h"

#import "GDTCORLibrary/Public/GDTCOREvent.h"
#import "GDTCORLibrary/Public/GDTCORRegistrar.h"

#import "GDTCORTests/Unit/Helpers/GDTCORAssertHelper.h"
#import "GDTCORTests/Unit/Helpers/GDTCORDataObjectTesterClasses.h"
#import "GDTCORTests/Unit/Helpers/GDTCORTestPrioritizer.h"
#import "GDTCORTests/Unit/Helpers/GDTCORTestUploader.h"

#import "GDTCORTests/Common/Fakes/GDTCORUploadCoordinatorFake.h"

#import "GDTCORTests/Common/Categories/GDTCORRegistrar+Testing.h"
#import "GDTCORTests/Common/Categories/GDTCORStorage+Testing.h"

static NSInteger target = kGDTCORTargetCCT;

@interface GDTCORStorageTest : GDTCORTestCase

/** The test backend implementation. */
@property(nullable, nonatomic) GDTCORTestUploader *testBackend;

/** The test prioritizer implementation. */
@property(nullable, nonatomic) GDTCORTestPrioritizer *testPrioritizer;

/** The uploader fake. */
@property(nonatomic) GDTCORUploadCoordinatorFake *uploaderFake;

@end

@implementation GDTCORStorageTest

- (void)setUp {
  [super setUp];
  self.testBackend = [[GDTCORTestUploader alloc] init];
  self.testPrioritizer = [[GDTCORTestPrioritizer alloc] init];
  [[GDTCORRegistrar sharedInstance] registerUploader:_testBackend target:target];
  [[GDTCORRegistrar sharedInstance] registerPrioritizer:_testPrioritizer target:target];
  self.uploaderFake = [[GDTCORUploadCoordinatorFake alloc] init];
  [GDTCORStorage sharedInstance].uploadCoordinator = self.uploaderFake;
}

- (void)tearDown {
  [super tearDown];
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
                });
  // Destroy these objects before the next test begins.
  self.testBackend = nil;
  self.testPrioritizer = nil;
  [[GDTCORRegistrar sharedInstance] reset];
  [[GDTCORStorage sharedInstance] reset];
  [GDTCORStorage sharedInstance].uploadCoordinator = [GDTCORUploadCoordinator sharedInstance];
  self.uploaderFake = nil;
}

/** Tests the singleton pattern. */
- (void)testInit {
  XCTAssertEqual([GDTCORStorage sharedInstance], [GDTCORStorage sharedInstance]);
}

/** Tests storing an event. */
- (void)testStoreEvent {
  // event is autoreleased, and the pool needs to drain.
  @autoreleasepool {
    GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString"];
    event.clockSnapshot = [GDTCORClock snapshot];
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  }
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertEqual([GDTCORStorage sharedInstance].storedEvents.count, 1);
    XCTAssertEqual([GDTCORStorage sharedInstance].targetToEventSet[@(target)].count, 1);
    NSURL *eventFile = [[GDTCORStorage sharedInstance].storedEvents lastObject].fileURL;
    XCTAssertNotNil(eventFile);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    NSError *error;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtURL:eventFile error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);
  });
}

/** Tests removing an event. */
- (void)testRemoveEvent {
  // event is autoreleased, and the pool needs to drain.
  @autoreleasepool {
    GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString"];
    event.clockSnapshot = [GDTCORClock snapshot];
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  }
  __block NSURL *eventFile;
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    eventFile = [[GDTCORStorage sharedInstance].storedEvents lastObject].fileURL;
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
  });
  [[GDTCORStorage sharedInstance] removeEvents:[GDTCORStorage sharedInstance].storedEvents.set];
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertFalse([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    XCTAssertEqual([GDTCORStorage sharedInstance].storedEvents.count, 0);
    XCTAssertEqual([GDTCORStorage sharedInstance].targetToEventSet[@(target)].count, 0);
  });
}

/** Tests removing a set of events. */
- (void)testRemoveEvents {
  GDTCORStorage *storage = [GDTCORStorage sharedInstance];
  __block GDTCOREvent *storedEvent1, *storedEvent2, *storedEvent3;

  // events are autoreleased, and the pool needs to drain.
  @autoreleasepool {
    GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString1"];
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
    dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
      storedEvent1 = [storage.storedEvents lastObject];
    });

    event = [[GDTCOREvent alloc] initWithMappingID:@"100" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString2"];
    writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
    dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
      storedEvent2 = [storage.storedEvents lastObject];
    });

    event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString3"];
    writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
    dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
      storedEvent3 = [storage.storedEvents lastObject];
    });
  }
  NSSet<GDTCOREvent *> *eventSet =
      [NSSet setWithObjects:storedEvent1, storedEvent2, storedEvent3, nil];
  [storage removeEvents:eventSet];
  dispatch_sync(storage.storageQueue, ^{
    XCTAssertFalse([storage.storedEvents containsObject:storedEvent1]);
    XCTAssertFalse([storage.storedEvents containsObject:storedEvent2]);
    XCTAssertFalse([storage.storedEvents containsObject:storedEvent3]);
    XCTAssertEqual(storage.targetToEventSet[@(target)].count, 0);
    for (GDTCOREvent *event in eventSet) {
      XCTAssertFalse([[NSFileManager defaultManager] fileExistsAtPath:event.fileURL.path]);
    }
  });
}

/** Tests storing a few different events. */
- (void)testStoreMultipleEvents {
  __block GDTCOREvent *storedEvent1, *storedEvent2, *storedEvent3;

  // events are autoreleased, and the pool needs to drain.
  @autoreleasepool {
    GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString1"];
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
    XCTAssertNotNil(event.fileURL);

    dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
      storedEvent1 = [[GDTCORStorage sharedInstance].storedEvents lastObject];
    });

    event = [[GDTCOREvent alloc] initWithMappingID:@"100" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString2"];
    writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
    XCTAssertNotNil(event.fileURL);

    dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
      storedEvent2 = [[GDTCORStorage sharedInstance].storedEvents lastObject];
    });

    event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString3"];
    writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
    XCTAssertNotNil(event.fileURL);

    dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
      storedEvent3 = [[GDTCORStorage sharedInstance].storedEvents lastObject];
    });
  }
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertEqual([GDTCORStorage sharedInstance].storedEvents.count, 3);
    XCTAssertEqual([GDTCORStorage sharedInstance].targetToEventSet[@(target)].count, 3);

    NSURL *event1File = storedEvent1.fileURL;
    XCTAssertNotNil(event1File);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:event1File.path]);
    NSError *error;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtURL:event1File error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);

    NSURL *event2File = storedEvent2.fileURL;
    XCTAssertNotNil(event2File);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:event2File.path]);
    error = nil;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtURL:event2File error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);

    NSURL *event3File = storedEvent3.fileURL;
    XCTAssertNotNil(event3File);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:event3File.path]);
    error = nil;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtURL:event3File error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);
  });
}

/** Tests enforcing that a prioritizer does not retain the DataObjectTransportBytes of an event in
 * memory.
 */
- (void)testEventDeallocationIsEnforced {
  __weak NSData *weakDataObjectTransportBytes;
  GDTCOREvent *event;
  @autoreleasepool {
    event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    weakDataObjectTransportBytes = [event.dataObject transportBytes];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString"];
    event.clockSnapshot = [GDTCORClock snapshot];
    // Store the event and wait for the expectation.
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  }
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertNil(weakDataObjectTransportBytes);
    XCTAssertNotNil(event);
  });

  NSURL *eventFile;
  eventFile = [[GDTCORStorage sharedInstance].storedEvents lastObject].fileURL;

  // This isn't strictly necessary because of the -waitForExpectations above.
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
  });

  // Ensure event was removed.
  [[GDTCORStorage sharedInstance] removeEvents:[GDTCORStorage sharedInstance].storedEvents.set];
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertFalse([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    XCTAssertEqual([GDTCORStorage sharedInstance].storedEvents.count, 0);
    XCTAssertEqual([GDTCORStorage sharedInstance].targetToEventSet[@(target)].count, 0);
  });
}

/** Tests encoding and decoding the storage singleton correctly. */
- (void)testNSSecureCoding {
  XCTAssertTrue([GDTCORStorage supportsSecureCoding]);
  GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
  event.clockSnapshot = [GDTCORClock snapshot];
  event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString"];
  XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                   onComplete:^(BOOL wasWritten, NSError *error) {
                                                     XCTAssertTrue(wasWritten);
                                                     [writtenExpectation fulfill];
                                                   }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  event = nil;
  __block NSData *storageData;
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    if (@available(macOS 10.13, iOS 11.0, tvOS 11.0, *)) {
      storageData = [NSKeyedArchiver archivedDataWithRootObject:[GDTCORStorage sharedInstance]
                                          requiringSecureCoding:YES
                                                          error:nil];
    } else {
#if !TARGET_OS_MACCATALYST
      storageData = [NSKeyedArchiver archivedDataWithRootObject:[GDTCORStorage sharedInstance]];
#endif
    }
  });
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertNotNil([[GDTCORStorage sharedInstance].storedEvents lastObject]);
  });
  [[GDTCORStorage sharedInstance] removeEvents:[GDTCORStorage sharedInstance].storedEvents.set];
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertNil([[GDTCORStorage sharedInstance].storedEvents lastObject]);
  });
  GDTCORStorage *unarchivedStorage;
  NSError *error;
  if (@available(macOS 10.13, iOS 11.0, tvOS 11.0, *)) {
    unarchivedStorage = [NSKeyedUnarchiver unarchivedObjectOfClass:[GDTCORStorage class]
                                                          fromData:storageData
                                                             error:&error];
  } else {
#if !TARGET_OS_MACCATALYST
    unarchivedStorage = [NSKeyedUnarchiver unarchiveObjectWithData:storageData];
#endif
  }
  XCTAssertNotNil([unarchivedStorage.storedEvents lastObject]);
}

/** Tests encoding and decoding the storage singleton when calling -sharedInstance. */
- (void)testNSSecureCodingWithSharedInstance {
  GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
  event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString"];
  event.clockSnapshot = [GDTCORClock snapshot];
  XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                   onComplete:^(BOOL wasWritten, NSError *error) {
                                                     XCTAssertTrue(wasWritten);
                                                     [writtenExpectation fulfill];
                                                   }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  event = nil;
  __block NSData *storageData;
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    if (@available(macOS 10.13, iOS 11.0, tvOS 11.0, *)) {
      storageData = [NSKeyedArchiver archivedDataWithRootObject:[GDTCORStorage sharedInstance]
                                          requiringSecureCoding:YES
                                                          error:nil];
    } else {
#if !TARGET_OS_MACCATALYST
      storageData = [NSKeyedArchiver archivedDataWithRootObject:[GDTCORStorage sharedInstance]];
#endif
    }
  });
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertNotNil([[GDTCORStorage sharedInstance].storedEvents lastObject]);
  });
  [[GDTCORStorage sharedInstance] removeEvents:[GDTCORStorage sharedInstance].storedEvents.set];
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertNil([[GDTCORStorage sharedInstance].storedEvents lastObject]);
  });
  GDTCORStorage *unarchivedStorage;
  if (@available(macOS 10.13, iOS 11.0, tvOS 11.0, *)) {
    unarchivedStorage = [NSKeyedUnarchiver unarchivedObjectOfClass:[GDTCORStorage class]
                                                          fromData:storageData
                                                             error:nil];
  } else {
#if !TARGET_OS_MACCATALYST
    unarchivedStorage = [NSKeyedUnarchiver unarchiveObjectWithData:storageData];
#endif
  }
  XCTAssertNotNil([unarchivedStorage.storedEvents lastObject]);
}

/** Tests sending a fast priority event causes an upload attempt. */
- (void)testQoSTierFast {
  // event is autoreleased, and the pool needs to drain.
  @autoreleasepool {
    GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString"];
    event.qosTier = GDTCOREventQoSFast;
    event.clockSnapshot = [GDTCORClock snapshot];
    XCTAssertFalse(self.uploaderFake.forceUploadCalled);
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       XCTAssertNil(error);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  }
  dispatch_sync([GDTCORStorage sharedInstance].storageQueue, ^{
    XCTAssertTrue(self.uploaderFake.forceUploadCalled);
    XCTAssertEqual([GDTCORStorage sharedInstance].storedEvents.count, 1);
    XCTAssertEqual([GDTCORStorage sharedInstance].targetToEventSet[@(target)].count, 1);
    NSURL *eventFile = [[GDTCORStorage sharedInstance].storedEvents lastObject].fileURL;
    XCTAssertNotNil(eventFile);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    NSError *error;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtURL:eventFile error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);
  });
}

/** Fuzz tests the storing of events at the same time as a terminate lifecycle notification. This
 * test can fail if there's simultaneous access to ivars of GDTCORStorage with one access being
 * off the storage's queue. The terminate lifecycle event should operate on and flush the queue.
 */
- (void)testStoringEventsDuringTerminate {
  int numberOfIterations = 1000;
  for (int i = 0; i < numberOfIterations; i++) {
    NSString *testString = [NSString stringWithFormat:@"testString %d", i];
    GDTCOREvent *event = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
    event.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:testString];
    event.clockSnapshot = [GDTCORClock snapshot];
    XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
    XCTAssertNoThrow([[GDTCORStorage sharedInstance] storeEvent:event
                                                     onComplete:^(BOOL wasWritten, NSError *error) {
                                                       XCTAssertTrue(wasWritten);
                                                       [writtenExpectation fulfill];
                                                     }]);
    [self waitForExpectationsWithTimeout:10 handler:nil];
    if (i % 5 == 0) {
      [[GDTCORStorage sharedInstance] removeEvents:[GDTCORStorage sharedInstance].storedEvents.set];
    }
    [NSNotificationCenter.defaultCenter
        postNotificationName:kGDTCORApplicationWillTerminateNotification
                      object:nil];
  }
}

/** Tests migration from v1 of the storage format to v2. */
- (void)testMigrationFromOldVersion {
  static NSString *base64EncodedArchive =
      @"YnBsaXN0MDDUAAEAAgADAAQABQAGAAcAClgkdmVyc2lvblkkYXJjaGl2ZXJUJHRvcFgkb2JqZWN0cxIAAYagXxAPTlN"
      @"LZXllZEFyY2hpdmVy0QAIAAlUcm9vdIABrxBxAAsADAAVADsASQBPAFUAVgBcAGAAYQBiAGMAbQBxAHUAfQCBAIUAhg"
      @"CKAJIAlgCaAJsAnwCnAKsArwCwALQAvADAAMQAxQDGAMoA0gDWANoA2wDfAOcA6wDvAPAA8QD1AP0BAQEFAQYBCgESA"
      @"RYBGgEbAR8BJwErAS8BMAE0ATwBQAFEAUUBSQFRAVUBWQFaAV4BZgFqAW4BbwFwAXQBfAGAAYQBhQGJAZEBlQGZAZoB"
      @"ngGmAaoBrgGvAbABtAG8AcABxAHFAckB0QHVAdkB2gHeAeMB7QH2AfsCCgIPAhECFVUkbnVsbNQADQAOAA8AEAARABI"
      @"AEwAUXxAhR0RUQ09SU3RvcmFnZVVwbG9hZENvb3JkaW5hdG9yS2V5XxAgR0RUQ09SU3RvcmFnZVRhcmdldFRvRXZlbn"
      @"RTZXRLZXlfEBxHRFRDT1JTdG9yYWdlU3RvcmVkRXZlbnRzS2V5ViRjbGFzc4BugGmAAoBw3xATABYAFwAYABkAGgAbA"
      @"BwAHQAeAB8AIAAQACEAIgAjACQAJQAmACcAKAApACoAKwAsAC0ALgAvADAAMQAyADMANAA1ADYANwA4ADkAOltOUy5v"
      @"YmplY3QuNlxOUy5vYmplY3QuMTZbTlMub2JqZWN0LjdbTlMub2JqZWN0LjhcTlMub2JqZWN0LjE3W05TLm9iamVjdC4"
      @"5XE5TLm9iamVjdC4xMFxOUy5vYmplY3QuMTFbTlMub2JqZWN0LjBcTlMub2JqZWN0LjEyW05TLm9iamVjdC4xW05TLm"
      @"9iamVjdC4yXE5TLm9iamVjdC4xM1tOUy5vYmplY3QuM1xOUy5vYmplY3QuMTRbTlMub2JqZWN0LjRbTlMub2JqZWN0L"
      @"jVcTlMub2JqZWN0LjE1gCmAXoAvgDSAY4A5gD6AQ4ADgEiAD4BogBSAToAZgFOAHoAkgFjXABAAPAA9AD4APwBAAEEA"
      @"QgBDAEQARQBGAEcASF8QGkdEVENPUlN0b3JlZEV2ZW50VGFyZ2V0S2V5XxAeR0RUQ09SU3RvcmVkRXZlbnREYXRhRnV"
      @"0dXJlS2V5XxAbR0RUQ09SU3RvcmVkRXZlbnRRb3NUaWVyS2V5XxAlR0RUQ09SU3RvcmVkRXZlbnRjdXN0b21CeXRlc1"
      @"BhcmFtc0tleV8QIUdEVENPUlN0b3JlZEV2ZW50Q2xvY2tTbmFwc2hvdEtleV8QHUdEVENPUlN0b3JlZEV2ZW50TWFwc"
      @"GluZ0lES2V5gA6ACoAEgAuAAIAMgAnTABAASgBLAEwARgBOXxAXR0RUQ09SRGF0YUZ1dHVyZURhdGFLZXlfEBpHRFRD"
      @"T1JEYXRhRnV0dXJlRmlsZVVSTEtleYAIgACABdMAUAAQAFEARgBTAFRXTlMuYmFzZVtOUy5yZWxhdGl2ZYAAgAeABl8"
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      @"jgWOhZHFkkWSxZNFloWXBZeFmAXRxdJF14XYBdpF3IXjxeRF5MXlReXF5kXmxedF6oXrBeuF7AXvRe/F8EXwxiqGL8Y"
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      @"wGnIafxqBGoMahRtsG24bgxuFG44blxu0G7YbuBu6G7wbvhvAG8IbzxvRG9Mb1RviG+Qb5hvoHM8c5BzmHO8c+B0VHR"
      @"cdGR0bHR0dHx0hHSMdMB0yHTQdNh1DHUUdRx1JHjAeRR5HHlAeWR5iHngefx6VHqIerx63HsIexx7JHsse0B7SHtQe1"
      @"h7fHuwe7h7wHvIe9B72Hvge+h8DHxAfFx8kHyofMx9MH04fUB9SH1QfVh9YH1ofXB9eH2AfYh9kH2Yfbx+FH4wfoh+v"
      @"H7Qfth+/H9kf3h/4IAEgDyAUAAAAAAAAAgIAAAAAAAACGQAAAAAAAAAAAAAAAAAAICI=";

  NSData *v1ArchiveData = [[NSData alloc] initWithBase64EncodedString:base64EncodedArchive
                                                              options:0];
  XCTAssertNotNil(v1ArchiveData);
  GDTCORStorage *archiveStorage;
  XCTAssertNoThrow(archiveStorage = [NSKeyedUnarchiver unarchiveObjectWithData:v1ArchiveData]);
  XCTAssertEqual(archiveStorage.targetToEventSet[@(kGDTCORTargetCCT)].count, 6);
  XCTAssertEqual(archiveStorage.targetToEventSet[@(kGDTCORTargetFLL)].count, 12);
  XCTAssertEqual(archiveStorage.storedEvents.count, 18);
  for (GDTCOREvent *event in archiveStorage.storedEvents) {
    XCTAssertNotNil(event.fileURL);
  }
  XCTAssertNotNil(archiveStorage.uploadCoordinator);
}

@end