firebase-ios-sdk/Example/Database/Tests/Integration/FRealtime.m

/*
 * Copyright 2017 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 "FRealtime.h"
#import "FTupleFirebase.h"
#import "FRepoManager.h"
#import "FUtilities.h"
#import "FParsedUrl.h"
#import "FIRDatabaseConfig_Private.h"
#import "FTestHelpers.h"

@implementation FRealtime

- (void) testUrlParsing {
    FParsedUrl* parsed = [FUtilities parseUrl:@"http://www.example.com:9000"];
    XCTAssertTrue([[parsed.path description] isEqualToString:@"/"], @"Got correct path");
    XCTAssertTrue([parsed.repoInfo.host isEqualToString:@"www.example.com:9000"], @"Got correct host");
    XCTAssertTrue([parsed.repoInfo.internalHost isEqualToString:@"www.example.com:9000"], @"Got correct host");
    XCTAssertFalse(parsed.repoInfo.secure, @"Should not be secure, there's a port");

    parsed = [FUtilities parseUrl:@"http://www.firebaseio.com/foo/bar"];
    XCTAssertTrue([[parsed.path description] isEqualToString:@"/foo/bar"], @"Got correct path");
    XCTAssertTrue([parsed.repoInfo.host isEqualToString:@"www.firebaseio.com"], @"Got correct host");
    XCTAssertTrue([parsed.repoInfo.internalHost isEqualToString:@"www.firebaseio.com"], @"Got correct host");
    XCTAssertTrue(parsed.repoInfo.secure, @"Should be secure, there's no port");
}

- (void) testCachingRedirects {
    NSString* host = @"host.example.com";
    NSString* host2 = @"host2.example.com";
    NSString* internalHost = @"internal.example.com";
    NSString* internalHost2 = @"internal2.example.com";

    // Set host on first repo info
    FRepoInfo* repoInfo = [[FRepoInfo alloc] initWithHost:host isSecure:YES withNamespace:host];
    XCTAssertTrue([repoInfo.host isEqualToString:host], @"Got correct host");
    XCTAssertTrue([repoInfo.internalHost isEqualToString:host], @"Got correct host");

    // Set internal host on first repo info
    repoInfo.internalHost = internalHost;
    XCTAssertTrue([repoInfo.host isEqualToString:host], @"Got correct host");
    XCTAssertTrue([repoInfo.internalHost isEqualToString:internalHost], @"Got correct host");

    // Set up a second unrelated repo info to make sure caching is keyspaced properly
    FRepoInfo* repoInfo2 = [[FRepoInfo alloc] initWithHost:host2 isSecure:YES withNamespace:host2];
    XCTAssertTrue([repoInfo2.host isEqualToString:host2], @"Got correct host");
    XCTAssertTrue([repoInfo2.internalHost isEqualToString:host2], @"Got correct host");

    repoInfo2.internalHost = internalHost2;
    XCTAssertTrue([repoInfo2.internalHost isEqualToString:internalHost2], @"Got correct host");

    // Setting host on this repo info should also set the right internal host
    FRepoInfo* repoInfoCached = [[FRepoInfo alloc] initWithHost:host isSecure:YES withNamespace:host];
    XCTAssertTrue([repoInfoCached.host isEqualToString:host], @"Got correct host");
    XCTAssertTrue([repoInfoCached.internalHost isEqualToString:internalHost], @"Got correct host");

    [repoInfo clearInternalHostCache];
    [repoInfo2 clearInternalHostCache];
    [repoInfoCached clearInternalHostCache];

    XCTAssertTrue([repoInfo.internalHost isEqualToString:host], @"Got correct host");
    XCTAssertTrue([repoInfo2.internalHost isEqualToString:host2], @"Got correct host");
    XCTAssertTrue([repoInfoCached.internalHost isEqualToString:host], @"Got correct host");
}

- (void) testOnDisconnectSetWorks {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseConfig *readerCfg = [FTestHelpers configForName:@"reader"];

    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];
    FIRDatabaseReference * reader = [[[FIRDatabaseReference alloc] initWithConfig:readerCfg] child:writer.key];

    __block NSNumber* readValue = @0;
    __block NSNumber* writeValue = @0;
    [[reader child:@"disconnected"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        NSNumber *val = [snapshot value];
        if (![val isEqual:[NSNull null]]) {
            readValue = val;
        }
    }];

    [[writer child:@"disconnected"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        id val = [snapshot value];
        if (val != [NSNull null]) {
            writeValue = val;
        }
    }];

    [writer child:@"hello"];

    __block BOOL ready = NO;
    [[writer child:@"disconnected"] onDisconnectSetValue:@1 withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref){
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    [writer child:@"s"];

    ready = NO;
    [[writer child:@"disconnected"] onDisconnectSetValue:@2 withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref){
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return [@2 isEqualToNumber:readValue] && [@2 isEqualToNumber:writeValue];
    }];

    [FRepoManager interrupt:readerCfg];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
    [FRepoManager disposeRepos:readerCfg];
}

- (void) testOnDisconnectSetWithPriorityWorks {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseConfig *readerCfg = [FTestHelpers configForName:@"reader"];

    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];
    FIRDatabaseReference * reader = [[[FIRDatabaseReference alloc] initWithConfig:readerCfg] child:writer.key];

    __block BOOL sawNewValue = NO;
    __block BOOL writerSawNewValue = NO;
    [[reader child:@"disconnected"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        id val = snapshot.value;
        id pri = snapshot.priority;
        if (val != [NSNull null] && pri != [NSNull null]) {
            sawNewValue = [(NSNumber *) val boolValue] && [pri isEqualToString:@"abcd"];
        }
    }];

    [[writer child:@"disconnected"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        id val = [snapshot value];
        id pri = snapshot.priority;
        if (val != [NSNull null] && pri != [NSNull null]) {
            writerSawNewValue = [(NSNumber *) val boolValue] && [pri isEqualToString:@"abcd"];
        }
    }];

    __block BOOL ready = NO;
    [[writer child:@"disconnected"] onDisconnectSetValue:@YES andPriority:@"abcd" withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return sawNewValue && writerSawNewValue;
    }];

    [FRepoManager interrupt:readerCfg];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
    [FRepoManager disposeRepos:readerCfg];
}

- (void) testOnDisconnectRemoveWorks {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseConfig *readerCfg = [FTestHelpers configForName:@"reader"];

    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];
    FIRDatabaseReference * reader = [[[FIRDatabaseReference alloc] initWithConfig:readerCfg] child:writer.key];

    __block BOOL ready = NO;
    [[writer child:@"foo"] setValue:@"bar" withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    __block BOOL sawRemove = NO;
    __block BOOL writerSawRemove = NO;
    [[reader child:@"foo"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        sawRemove = [[NSNull null] isEqual:snapshot.value];
    }];

    [[writer child:@"foo"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        writerSawRemove = [[NSNull null] isEqual:snapshot.value];
    }];

    ready = NO;
    [[writer child:@"foo"] onDisconnectRemoveValueWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];
    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return sawRemove && writerSawRemove;
    }];

    [FRepoManager interrupt:readerCfg];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
    [FRepoManager disposeRepos:readerCfg];
}

- (void) testOnDisconnectUpdateWorks {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseConfig *readerCfg = [FTestHelpers configForName:@"reader"];

    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];
    FIRDatabaseReference * reader = [[[FIRDatabaseReference alloc] initWithConfig:readerCfg] child:writer.key];

    [self waitForCompletionOf:[writer child:@"foo"] setValue:@{@"bar": @"a", @"baz": @"b"}];

    __block BOOL sawNewValue = NO;
    __block BOOL writerSawNewValue = NO;
    [[reader child:@"foo"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        NSDictionary *val = [snapshot value];
        if (val) {
            sawNewValue = [@{@"bar" : @"a", @"baz" : @"c", @"bat" : @"d"} isEqualToDictionary:val];
        }
    }];

    [[writer child:@"foo"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        NSDictionary *val = [snapshot value];
        if (val) {
            writerSawNewValue = [@{@"bar" : @"a", @"baz" : @"c", @"bat" : @"d"} isEqualToDictionary:val];
        }
    }];

    __block BOOL ready = NO;
    [[writer child:@"foo"] onDisconnectUpdateChildValues:@{@"baz": @"c", @"bat": @"d"} withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return sawNewValue && writerSawNewValue;
    }];

    [FRepoManager interrupt:readerCfg];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
    [FRepoManager disposeRepos:readerCfg];
}

- (void) testOnDisconnectTriggersSingleLocalValueEventForWriter {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];

    __block int calls = 0;
    [writer observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        calls++;
        if (calls == 2) {
            // second call, verify the data
            NSDictionary *val = [snapshot value];
            NSDictionary *expected = @{@"foo" : @{@"bar" : @"a", @"bam" : @"c"}};
            XCTAssertTrue([val isEqualToDictionary:expected], @"Got all of the updates in one");
        } else if (calls > 2) {
            XCTFail(@"Extra calls");
        }
    }];

    [self waitUntil:^BOOL{
        return calls == 1;
    }];

    __block BOOL done = NO;
    FIRDatabaseReference * child = [writer child:@"foo"];
    [child onDisconnectSetValue:@{@"bar": @"a", @"baz": @"b"}];
    [child onDisconnectUpdateChildValues:@{@"bam": @"c"}];
    [[child child:@"baz"] onDisconnectRemoveValueWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        done = YES;
    }];

    [self waitUntil:^BOOL{
        return done;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return calls == 2;
    }];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
}

- (void) testOnDisconnectTriggersSingleLocalValueEventForReader {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseReference * reader = [FTestHelpers getRandomNode];
    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] child:reader.key];

    __block int calls = 0;
    [reader observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        calls++;
        if (calls == 2) {
            // second call, verify the data
            NSDictionary *val = [snapshot value];
            NSDictionary *expected = @{@"foo" : @{@"bar" : @"a", @"bam" : @"c"}};
            XCTAssertTrue([val isEqualToDictionary:expected], @"Got all of the updates in one");
        } else if (calls > 2) {
            XCTFail(@"Extra calls");
        }
    }];

    [self waitUntil:^BOOL{
        return calls == 1;
    }];

    __block BOOL done = NO;
    FIRDatabaseReference * child = [writer child:@"foo"];
    [child onDisconnectSetValue:@{@"bar": @"a", @"baz": @"b"}];
    [child onDisconnectUpdateChildValues:@{@"bam": @"c"}];
    [[child child:@"baz"] onDisconnectRemoveValueWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        done = YES;
    }];

    [self waitUntil:^BOOL{
        return done;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return calls == 2;
    }];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
}

- (void) testOnDisconnectTriggersSingleLocalValueEventForWriterWithQuery {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];

    __block int calls = 0;
    [[[writer child:@"foo"] queryLimitedToLast:2] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        calls++;
        if (calls == 2) {
            // second call, verify the data
            NSDictionary *val = [snapshot value];
            NSDictionary *expected = @{@"bar" : @"a", @"bam" : @"c"};
            XCTAssertTrue([val isEqualToDictionary:expected], @"Got all of the updates in one");
        } else if (calls > 2) {
            XCTFail(@"Extra calls");
        }
    }];

    [self waitUntil:^BOOL{
        return calls == 1;
    }];

    __block BOOL done = NO;
    FIRDatabaseReference * child = [writer child:@"foo"];
    [child onDisconnectSetValue:@{@"bar": @"a", @"baz": @"b"}];
    [child onDisconnectUpdateChildValues:@{@"bam": @"c"}];
    [[child child:@"baz"] onDisconnectRemoveValueWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        done = YES;
    }];

    [self waitUntil:^BOOL{
        return done;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return calls == 2;
    }];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
}

- (void) testOnDisconnectTriggersSingleLocalValueEventForReaderWithQuery {
    FIRDatabaseReference * reader = [FTestHelpers getRandomNode];
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] child:reader.key];

    __block int calls = 0;
    [[[reader child:@"foo"] queryLimitedToLast:2] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        calls++;
        XCTAssertTrue([snapshot.key isEqualToString:@"foo"], @"Got the right snapshot");
        if (calls == 2) {
            // second call, verify the data
            NSDictionary *val = [snapshot value];
            NSDictionary *expected = @{@"bar" : @"a", @"bam" : @"c"};
            XCTAssertTrue([val isEqualToDictionary:expected], @"Got all of the updates in one");
        } else if (calls > 2) {
            XCTFail(@"Extra calls");
        }
    }];

    [self waitUntil:^BOOL{
        return calls == 1;
    }];

    __block BOOL done = NO;
    FIRDatabaseReference * child = [writer child:@"foo"];
    [child onDisconnectSetValue:@{@"bar": @"a", @"baz": @"b"}];
    [child onDisconnectUpdateChildValues:@{@"bam": @"c"}];
    [[child child:@"baz"] onDisconnectRemoveValueWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        done = YES;
    }];

    [self waitUntil:^BOOL{
        return done;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return calls == 2;
    }];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
}

- (void) testOnDisconnectDeepMergeTriggersOnlyOneValueEventForReaderWithQuery {
    FIRDatabaseReference * reader = [FTestHelpers getRandomNode];
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];

    __block BOOL done = NO;
    NSDictionary* toSet = @{@"a": @1, @"b": @{@"c": @YES, @"d": @"scalar", @"e": @{@"f": @"hooray"}}};
    [writer setValue:toSet];
    [[writer child:@"a"] onDisconnectSetValue:@2];
    [[writer child:@"b/d"] onDisconnectRemoveValueWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        done = YES;
    }];

    WAIT_FOR(done);

    __block int count = 2;
    [[reader queryLimitedToLast:3] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        count++;
        if (count == 1) {
            // Loaded the data, kill the writer connection
            [FRepoManager interrupt:writerCfg];
        } else if (count == 2) {
            NSDictionary *expected = @{@"a" : @2, @"b" : @{@"c" : @YES, @"e" : @{@"f" : @"hooray"}}};
            XCTAssertTrue([snapshot.value isEqualToDictionary:expected], @"Should see complete new snapshot");
        } else {
            XCTFail(@"Too many calls");
        }
    }];

    WAIT_FOR(count == 2);

    // cleanup
    [reader removeAllObservers];
    [FRepoManager disposeRepos:writerCfg];
}


- (void) testOnDisconnectCancelWorks {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseConfig *readerCfg = [FTestHelpers configForName:@"reader"];

    FIRDatabaseReference * writer = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];
    FIRDatabaseReference * reader = [[[FIRDatabaseReference alloc] initWithConfig:readerCfg] child:writer.key];

    __block BOOL ready = NO;
    [[writer child:@"foo"] setValue:@{@"bar": @"a", @"baz": @"b"} withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    __block BOOL sawNewValue = NO;
    __block BOOL writerSawNewValue = NO;
    [[reader child:@"foo"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        NSDictionary *val = [snapshot value];
        if (val) {
            sawNewValue = [@{@"bar" : @"a", @"baz" : @"b", @"bat" : @"d"} isEqualToDictionary:val];
        }
    }];

    [[writer child:@"foo"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        NSDictionary *val = [snapshot value];
        if (val) {
            writerSawNewValue = [@{@"bar" : @"a", @"baz" : @"b", @"bat" : @"d"} isEqualToDictionary:val];
        }
    }];

    ready = NO;
    [[writer child:@"foo"] onDisconnectUpdateChildValues:@{@"baz": @"c", @"bat": @"d"}];
    [[writer child:@"foo/baz"] cancelDisconnectOperationsWithCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
        ready = YES;
    }];

    [self waitUntil:^BOOL{
        return ready;
    }];

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        return sawNewValue && writerSawNewValue;
    }];

    [FRepoManager interrupt:readerCfg];

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
    [FRepoManager disposeRepos:readerCfg];
}

- (void) testOnDisconnectWithServerValuesWithLocalEvents {
    FIRDatabaseConfig *writerCfg = [FTestHelpers configForName:@"writer"];
    FIRDatabaseReference * node = [[[FIRDatabaseReference alloc] initWithConfig:writerCfg] childByAutoId];

    __block FIRDataSnapshot *snap = nil;
    [node observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
        snap = snapshot;
    }];

    NSDictionary* data = @{
      @"a": @1,
      @"b": @{
        @".value": [FIRServerValue timestamp],
        @".priority": [FIRServerValue timestamp]
      }
    };

    __block BOOL done = NO;
    [node onDisconnectSetValue:data andPriority:[FIRServerValue timestamp] withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
      done = YES;
    }];

    [self waitUntil:^BOOL{
        return done;
    }];

    done = NO;

    [node onDisconnectUpdateChildValues:@{ @"a": [FIRServerValue timestamp], @"c": [FIRServerValue timestamp] } withCompletionBlock:^(NSError* error, FIRDatabaseReference * ref) {
      done = YES;
    }];

    [self waitUntil:^BOOL{
        return done;
    }];

    done = NO;

    [FRepoManager interrupt:writerCfg];

    [self waitUntil:^BOOL{
        if ([snap value] != [NSNull null]) {
          NSDictionary* val = [snap value];
          done = (val[@"a"] && val[@"b"] && val[@"c"]);
        }
        return done;
    }];

    NSDictionary* value = [snap value];
    NSNumber* now = [NSNumber numberWithDouble:round([[NSDate date] timeIntervalSince1970]*1000)];
    NSNumber* timestamp = [snap priority];
    XCTAssertTrue([[snap priority] isKindOfClass:[NSNumber class]], @"Should get back number");
    XCTAssertTrue([now doubleValue] - [timestamp doubleValue] < 2000, @"Number should be no more than 2 seconds ago");
    XCTAssertEqualObjects([snap priority], [value objectForKey:@"a"], @"Should get back matching ServerValue.TIMESTAMP");
    XCTAssertEqualObjects([snap priority], [value objectForKey:@"b"], @"Should get back matching ServerValue.TIMESTAMP");
    XCTAssertEqualObjects([snap priority], [[snap childSnapshotForPath:@"b"] priority], @"Should get back matching ServerValue.TIMESTAMP");
    XCTAssertEqualObjects([NSNull null], [[snap childSnapshotForPath:@"d"] value], @"Should get null for cancelled child");

    // cleanup
    [FRepoManager disposeRepos:writerCfg];
}

@end