firebase-ios-sdk/GoogleDataTransport/GDTCORTests/Unit/GDTCORFlatFileStorageTest.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/GDTCORFlatFileStorage.h"
#import "GDTCORLibrary/Private/GDTCORRegistrar_Private.h"

#import "GDTCORLibrary/Public/GDTCOREvent.h"
#import "GDTCORLibrary/Public/GDTCORPlatform.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/GDTCORFlatFileStorage+Testing.h"
#import "GDTCORTests/Common/Categories/GDTCORRegistrar+Testing.h"

static NSInteger target = kGDTCORTargetCCT;

@interface GDTCORFlatFileStorageTest : 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 GDTCORFlatFileStorageTest

- (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];
  [GDTCORFlatFileStorage sharedInstance].uploadCoordinator = self.uploaderFake;
}

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

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

/** Tests storing an event. */
- (void)testStoreEvent {
  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([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];

  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 1);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].targetToEventSet[@(target)].count, 1);
    NSURL *eventFile = event.fileURL;
    XCTAssertNotNil(eventFile);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    NSError *error;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtPath:eventFile.path error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);
  });
}

/** Tests removing an event. */
- (void)testRemoveEvent {
  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([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];

  __block NSURL *eventFile;
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    eventFile = event.fileURL;
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
  });
  NSSet *eventIDs =
      [NSSet setWithArray:[[GDTCORFlatFileStorage sharedInstance].storedEvents allKeys]];
  [[GDTCORFlatFileStorage sharedInstance] removeEvents:eventIDs];
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertFalse([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 0);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].targetToEventSet[@(target)].count, 0);
  });
}

/** Tests removing a set of events. */
- (void)testRemoveEvents {
  GDTCORFlatFileStorage *storage = [GDTCORFlatFileStorage sharedInstance];

  GDTCOREvent *event1 = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
  event1.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString1"];
  XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event1
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event1.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];

  GDTCOREvent *event2 = [[GDTCOREvent alloc] initWithMappingID:@"100" target:target];
  event2.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString2"];
  writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event2
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event2.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];

  GDTCOREvent *event3 = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
  event3.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString3"];
  writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event3
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event3.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];

  NSSet<NSNumber *> *eventIDSet =
      [NSSet setWithObjects:event1.eventID, event2.eventID, event3.eventID, nil];
  [storage removeEvents:eventIDSet];
  NSSet<GDTCOREvent *> *eventSet = [NSSet setWithObjects:event1, event2, event3, nil];
  dispatch_sync(storage.storageQueue, ^{
    XCTAssertNil(storage.storedEvents[event1.eventID]);
    XCTAssertNil(storage.storedEvents[event2.eventID]);
    XCTAssertNil(storage.storedEvents[event3.eventID]);
    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 {
  GDTCOREvent *event1 = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
  event1.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString1"];
  XCTestExpectation *writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event1
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event1.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  XCTAssertNotNil(event1.fileURL);

  GDTCOREvent *event2 = [[GDTCOREvent alloc] initWithMappingID:@"100" target:target];
  event2.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString2"];
  writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event2
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event2.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  XCTAssertNotNil(event2.fileURL);

  GDTCOREvent *event3 = [[GDTCOREvent alloc] initWithMappingID:@"404" target:target];
  event3.dataObject = [[GDTCORDataObjectTesterSimple alloc] initWithString:@"testString3"];
  writtenExpectation = [self expectationWithDescription:@"event written"];
  XCTAssertNoThrow([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event3
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event3.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  XCTAssertNotNil(event3.fileURL);

  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 3);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].targetToEventSet[@(target)].count, 3);

    NSURL *event1File = event1.fileURL;
    XCTAssertNotNil(event1File);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:event1File.path]);
    NSError *error;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtPath:event1File.path error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);

    NSURL *event2File = event2.fileURL;
    XCTAssertNotNil(event2File);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:event2File.path]);
    error = nil;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtPath:event2File.path error:&error]);
    XCTAssertNil(error, @"There was an error deleting the eventFile: %@", error);

    NSURL *event3File = event3.fileURL;
    XCTAssertNotNil(event3File);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:event3File.path]);
    error = nil;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtPath:event3File.path 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([[GDTCORFlatFileStorage sharedInstance]
        storeEvent:event
        onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
          XCTAssertNotEqualObjects(event.eventID, @0);
          XCTAssertNil(error);
          [writtenExpectation fulfill];
        }]);
    [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  }
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertNil(weakDataObjectTransportBytes);
    XCTAssertNotNil(event);
  });

  NSURL *eventFile = event.fileURL;

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

  // Ensure event was removed.
  NSSet *eventIDs =
      [NSSet setWithArray:[[GDTCORFlatFileStorage sharedInstance].storedEvents allKeys]];
  [[GDTCORFlatFileStorage sharedInstance] removeEvents:eventIDs];
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertFalse([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 0);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].targetToEventSet[@(target)].count, 0);
  });
}

/** Tests encoding and decoding the storage singleton correctly. */
- (void)testNSSecureCoding {
  XCTAssertTrue([GDTCORFlatFileStorage 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([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event.eventID, @0);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  event = nil;
  __block NSData *storageData;
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    NSError *error;
    storageData = GDTCOREncodeArchive([GDTCORFlatFileStorage sharedInstance], nil, &error);
    XCTAssertNil(error);
    XCTAssertNotNil(storageData);
  });
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 1);
  });
  NSSet *eventIDs =
      [NSSet setWithArray:[[GDTCORFlatFileStorage sharedInstance].storedEvents allKeys]];
  [[GDTCORFlatFileStorage sharedInstance] removeEvents:eventIDs];
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 0);
  });
  NSError *error;
  GDTCORFlatFileStorage *unarchivedStorage = (GDTCORFlatFileStorage *)GDTCORDecodeArchive(
      [GDTCORFlatFileStorage class], nil, storageData, &error);
  XCTAssertNil(error);
  XCTAssertNotNil(unarchivedStorage);
  XCTAssertGreaterThan([unarchivedStorage storedEvents].count, 0);
}

/** 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([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event
      onComplete:^(BOOL wasWritten, NSError *_Nullable error) {
        XCTAssertNotEqualObjects(event.eventID, @0);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];
  event = nil;
  __block NSData *storageData;
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    NSError *error;
    storageData = GDTCOREncodeArchive([GDTCORFlatFileStorage sharedInstance], nil, &error);
    XCTAssertNil(error);
    XCTAssertNotNil(storageData);
  });
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertNotNil([GDTCORFlatFileStorage sharedInstance].storedEvents);
    XCTAssertGreaterThan([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 0);
  });
  NSSet *eventIDs =
      [NSSet setWithArray:[[GDTCORFlatFileStorage sharedInstance].storedEvents allKeys]];
  [[GDTCORFlatFileStorage sharedInstance] removeEvents:eventIDs];
  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertNotNil([GDTCORFlatFileStorage sharedInstance].storedEvents);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 0);
  });
  NSError *error;
  GDTCORFlatFileStorage *unarchivedStorage = (GDTCORFlatFileStorage *)GDTCORDecodeArchive(
      [GDTCORFlatFileStorage class], nil, storageData, &error);
  XCTAssertNil(error);
  XCTAssertNotNil(unarchivedStorage);
  XCTAssertNotNil([unarchivedStorage storedEvents]);
  XCTAssertGreaterThan([unarchivedStorage storedEvents].count, 0);
}

/** Tests sending a fast priority event causes an upload attempt. */
- (void)testQoSTierFast {
  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([[GDTCORFlatFileStorage sharedInstance]
      storeEvent:event
      onComplete:^(BOOL wasWritten, NSError *error) {
        XCTAssertNotEqualObjects(event.eventID, @0);
        XCTAssertNil(error);
        [writtenExpectation fulfill];
      }]);
  [self waitForExpectations:@[ writtenExpectation ] timeout:10.0];

  dispatch_sync([GDTCORFlatFileStorage sharedInstance].storageQueue, ^{
    XCTAssertTrue(self.uploaderFake.forceUploadCalled);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].storedEvents.count, 1);
    XCTAssertEqual([GDTCORFlatFileStorage sharedInstance].targetToEventSet[@(target)].count, 1);
    NSURL *eventFile = event.fileURL;
    XCTAssertNotNil(eventFile);
    XCTAssertTrue([[NSFileManager defaultManager] fileExistsAtPath:eventFile.path]);
    NSError *error;
    XCTAssertTrue([[NSFileManager defaultManager] removeItemAtPath:eventFile.path 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 GDTCORFlatFileStorage 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([[GDTCORFlatFileStorage sharedInstance]
        storeEvent:event
        onComplete:^(BOOL wasWritten, NSError *error) {
          XCTAssertNotEqualObjects(event.eventID, @0);
          [writtenExpectation fulfill];
        }]);
    [self waitForExpectationsWithTimeout:10 handler:nil];
    if (i % 5 == 0) {
      NSSet *eventIDs =
          [NSSet setWithArray:[[GDTCORFlatFileStorage sharedInstance].storedEvents allKeys]];
      [[GDTCORFlatFileStorage sharedInstance] removeEvents:eventIDs];
    }
    [NSNotificationCenter.defaultCenter
        postNotificationName:kGDTCORApplicationWillTerminateNotification
                      object:nil];
  }
}

- (void)testSaveAndLoadLibraryData {
  __weak NSData *weakData;
  NSString *dataKey = NSStringFromSelector(_cmd);
  @autoreleasepool {
    NSData *data = [@"test data" dataUsingEncoding:NSUTF8StringEncoding];
    weakData = data;
    XCTestExpectation *expectation = [self expectationWithDescription:@"storage completion called"];
    [[GDTCORFlatFileStorage sharedInstance] storeLibraryData:data
                                                      forKey:dataKey
                                                  onComplete:^(NSError *_Nullable error) {
                                                    XCTAssertNil(error);
                                                    [expectation fulfill];
                                                  }];
    [self waitForExpectations:@[ expectation ] timeout:10.0];
  }
  XCTAssertNil(weakData);
  XCTestExpectation *expectation = [self expectationWithDescription:@"retrieval completion called"];
  [[GDTCORFlatFileStorage sharedInstance]
      libraryDataForKey:dataKey
             onComplete:^(NSData *_Nullable data, NSError *_Nullable error) {
               [expectation fulfill];
               XCTAssertNil(error);
               XCTAssertEqualObjects(@"test data",
                                     [[NSString alloc] initWithData:data
                                                           encoding:NSUTF8StringEncoding]);
             }];
  [self waitForExpectations:@[ expectation ] timeout:10.0];
}

- (void)testSavingNilLibraryData {
  XCTestExpectation *expectation = [self expectationWithDescription:@"storage completion called"];
  [[GDTCORFlatFileStorage sharedInstance] storeLibraryData:[NSData data]
                                                    forKey:@"test data key"
                                                onComplete:^(NSError *_Nullable error) {
                                                  XCTAssertNotNil(error);
                                                  [expectation fulfill];
                                                }];
  [self waitForExpectations:@[ expectation ] timeout:10.0];
}

- (void)testSaveAndRemoveLibraryData {
  NSString *dataKey = NSStringFromSelector(_cmd);
  NSData *data = [@"test data" dataUsingEncoding:NSUTF8StringEncoding];
  XCTestExpectation *expectation = [self expectationWithDescription:@"storage completion called"];
  [[GDTCORFlatFileStorage sharedInstance] storeLibraryData:data
                                                    forKey:dataKey
                                                onComplete:^(NSError *_Nullable error) {
                                                  XCTAssertNil(error);
                                                  [expectation fulfill];
                                                }];
  [self waitForExpectations:@[ expectation ] timeout:10.0];
  expectation = [self expectationWithDescription:@"retrieval completion called"];
  [[GDTCORFlatFileStorage sharedInstance]
      libraryDataForKey:dataKey
             onComplete:^(NSData *_Nullable data, NSError *_Nullable error) {
               [expectation fulfill];
               XCTAssertNil(error);
               XCTAssertEqualObjects(@"test data",
                                     [[NSString alloc] initWithData:data
                                                           encoding:NSUTF8StringEncoding]);
             }];
  [self waitForExpectations:@[ expectation ] timeout:10.0];
  expectation = [self expectationWithDescription:@"removal completion called"];
  [[GDTCORFlatFileStorage sharedInstance] removeLibraryDataForKey:dataKey
                                                       onComplete:^(NSError *error) {
                                                         [expectation fulfill];
                                                         XCTAssertNil(error);
                                                       }];
  [self waitForExpectations:@[ expectation ] timeout:10.0];
  expectation = [self expectationWithDescription:@"retrieval completion called"];
  [[GDTCORFlatFileStorage sharedInstance]
      libraryDataForKey:dataKey
             onComplete:^(NSData *_Nullable data, NSError *_Nullable error) {
               [expectation fulfill];
               XCTAssertNotNil(error);
               XCTAssertNil(data);
             }];
  [self waitForExpectations:@[ expectation ] timeout:10.0];
}

/** Tests migration from v1 of the storage format to v2. */
- (void)testMigrationFromOldVersion {
  static NSString *base64EncodedArchive =
      @"YnBsaXN0MDDUAAEAAgADAAQABQAGAAcAClgkdmVyc2lvblkkYXJjaGl2ZXJUJHRvcFgkb2JqZWN0cxIAAYagXxAPTlN"
      @"LZXllZEFyY2hpdmVy0QAIAAlUcm9vdIABrxBxAAsADAAVADsASQBPAFUAVgBcAGAAYQBiAGMAbQBxAHUAfQCBAIUAhg"
      @"CKAJIAlgCaAJsAnwCnAKsArwCwALQAvADAAMQAxQDGAMoA0gDWANoA2wDfAOcA6wDvAPAA8QD1AP0BAQEFAQYBCgESA"
      @"RYBGgEbAR8BJwErAS8BMAE0ATwBQAFEAUUBSQFRAVUBWQFaAV4BZgFqAW4BbwFwAXQBfAGAAYQBhQGJAZEBlQGZAZoB"
      @"ngGmAaoBrgGvAbABtAG8AcABxAHFAckB0QHVAdkB2gHeAeMB7QH2AfsCCgIPAhECFVUkbnVsbNQADQAOAA8AEAARABI"
      @"AEwAUXxAhR0RUQ09SU3RvcmFnZVVwbG9hZENvb3JkaW5hdG9yS2V5XxAgR0RUQ09SU3RvcmFnZVRhcmdldFRvRXZlbn"
      @"RTZXRLZXlfEBxHRFRDT1JTdG9yYWdlU3RvcmVkRXZlbnRzS2V5ViRjbGFzc4BugGmAAoBw3xATABYAFwAYABkAGgAbA"
      @"BwAHQAeAB8AIAAQACEAIgAjACQAJQAmACcAKAApACoAKwAsAC0ALgAvADAAMQAyADMANAA1ADYANwA4ADkAOltOUy5v"
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      @"MRAxMDFQMXAxkDGwMdAx8DIQMjA0ADXQN+A5wDxAPoBAgECgQMBA4EEAQSBBQEFgQjBD0EWgRcBF4EYARtBHUEgQSDB"
      @"IUEhwVuBXcFggWLBZEFlgWfBagFuwXABdMF2AXbBd0F8gYKBh4GQQZdBl8GaAZxBnoGgwaMBpgGnQapBrIGxgbLBt8G"
      @"/Ab+BwAHAgcEBwYHCAcKBxcHGQcbBx0HKgcsBy4HMAgXCCwILgg3CEAIXQhfCGEIYwhlCGcIaQhrCHgIegh8CH4Iiwi"
      @"NCI8IkQl4CY0JjwmYCaEJvgnACcIJxAnGCcgJygnMCdkJ2wndCd8J7AnuCfAJ8grZCu4K8Ar5CwILHwshCyMLJQsnCy"
      @"kLKwstCzoLPAs+C0ALTQtPC1ELUww6DDwMUQxTDFwMZQyCDIQMhgyIDIoMjAyODJAMnQyfDKEMowywDLIMtAy2DZ0Ns"
      @"g20Db0Nxg3jDeUN5w3pDesN7Q3vDfEN/g4ADgIOBA4RDhMOFQ4XDv4PAQ8WDxgPIQ8qD0cPSQ9LD00PTw9RD1MPVQ9i"
      @"D2QPZg9oD3UPdw95D3sQYhB3EHkQghCLEKgQqhCsEK4QsBCyELQQthDDEMUQxxDJENYQ2BDaENwRwxHYEdoR4xHsEgk"
      @"SCxINEg8SERITEhUSFxIkEiYSKBIqEjcSORI7Ej0TJBM5EzsTRBNNE2oTbBNuE3ATchN0E3YTeBOFE4cTiROLE5gTmh"
      @"OcE54UhRSaFJwUpRSuFMsUzRTPFNEU0xTVFNcU2RTmFOgU6hTsFPkU+xT9FP8V5hX7Ff0WBhYPFiwWLhYwFjIWNBY2F"
      @"jgWOhZHFkkWSxZNFloWXBZeFmAXRxdJF14XYBdpF3IXjxeRF5MXlReXF5kXmxedF6oXrBeuF7AXvRe/F8EXwxiqGL8Y"
      @"wRjKGNMY8BjyGPQY9hj4GPoY/Bj+GQsZDRkPGREZHhkgGSIZJBoLGiAaIhorGjQaURpTGlUaVxpZGlsaXRpfGmwabhp"
      @"wGnIafxqBGoMahRtsG24bgxuFG44blxu0G7YbuBu6G7wbvhvAG8IbzxvRG9Mb1RviG+Qb5hvoHM8c5BzmHO8c+B0VHR"
      @"cdGR0bHR0dHx0hHSMdMB0yHTQdNh1DHUUdRx1JHjAeRR5HHlAeWR5iHngefx6VHqIerx63HsIexx7JHsse0B7SHtQe1"
      @"h7fHuwe7h7wHvIe9B72Hvge+h8DHxAfFx8kHyofMx9MH04fUB9SH1QfVh9YH1ofXB9eH2AfYh9kH2Yfbx+FH4wfoh+v"
      @"H7Qfth+/H9kf3h/4IAEgDyAUAAAAAAAAAgIAAAAAAAACGQAAAAAAAAAAAAAAAAAAICI=";

  NSData *v1ArchiveData = [[NSData alloc] initWithBase64EncodedString:base64EncodedArchive
                                                              options:0];
  XCTAssertNotNil(v1ArchiveData);
  NSError *error;
  GDTCORFlatFileStorage *archiveStorage = (GDTCORFlatFileStorage *)GDTCORDecodeArchive(
      [GDTCORFlatFileStorage class], nil, v1ArchiveData, &error);
  XCTAssertNil(error);
  XCTAssertNotNil(archiveStorage);
  XCTAssertEqual(archiveStorage.targetToEventSet[@(kGDTCORTargetCCT)].count, 6);
  XCTAssertEqual(archiveStorage.targetToEventSet[@(kGDTCORTargetFLL)].count, 12);
  XCTAssertEqual(archiveStorage.storedEvents.count, 18);
  XCTAssertNotNil(archiveStorage.uploadCoordinator);
}

@end