Question

我正在开发一个列出当前体育赛事的应用程序。有关实时游戏的信息是使用REST从远程源获取的。第一个请求给出了他们的id和相应的竞技场ID的实时游戏列表。然后我必须从他们的id中获取竞技场名称。当一切都完成后，我发回一个包含实时游戏列表的NSArray。

我在测试通过块传递NSArray的解析方法时，在SenTestCase中发现了一个奇怪的混淆。在我的测试中，我能够执行[myArray count]并在NSLog中显示结果，但是当我使用EXC_BAD_ACCESS执行STAssertEquals([myArray count], 1, @"Error description")测试时崩溃。

这是我的代码减少到最小，我删除所有网络方面：

#import <SenTestingKit/SenTestingKit.h>


@interface LiveGameTests : SenTestCase
@end

@interface LiveGame : NSObject
@property (nonatomic) id gameID;
@property (strong, nonatomic) NSString *arenaName;
@end

@implementation LiveGame

// Create a live game object from a dictionary (this dictionary is the response of a first request to a remote server)
+(LiveGame *)gameWithData:(NSDictionary *)dict
{
    LiveGame *liveGame = [[LiveGame alloc] init];
    liveGame.gameID = dict[@"game_id"];    
    return liveGame;
}

// Complete a live game data with the element of a dictionary (those data are actualy fetched from a remote server in a different request.)
+(void)fetchRemainingData:(NSArray *)liveGameList completion:(void(^)(void))completion
{
    LiveGame *liveGame = liveGameList[0];
    liveGame.arenaName = @"arenaName";
    completion();
}

// Parse a NSArray of NSDictionaries representing live game
+(void)parseArrayOfDictionary:(NSArray *)arrayToParse success:(void(^)(NSArray *liveGameList))success
{
    NSMutableArray *liveGameList = [NSMutableArray arrayWithCapacity:[arrayToParse count]];

    // Iterate on all the NSDictionary of the NSArray and create live game from each NSDictionary 
    [arrayToParse enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL *stop)
     {
         liveGameList[idx] = [LiveGame gameWithData:obj];
     }];

    [LiveGame fetchRemainingData:liveGameList completion:^
     {
         success(liveGameList);
     }];
}
@end

@implementation LiveGameTests

-(void)testParseArrayOfDictionary
{
    [LiveGame parseArrayOfDictionary: @[@{@"game_id": @1}]
        success:^(NSArray *liveGameList)
        {
            // This line work fine and print: 2013-03-08 13:39:35.288 ShotClock[55177:c07] liveGameList count = 1
            NSLog(@"liveGameList count = %d",[liveGameList count]);

            // This crash the test on a EXC_BAD_ACCESS. What's wrong?
            STAssertEquals([liveGameList count], 1, @"The list of game must contain one unique live game but contain %@",[liveGameList count]);
        }];
}
@end

NSLog（@“liveGameList count =％d”，[liveGameList count]）; =＆GT;此行工作正常并打印：2013-03-08 13：39：35.288 ShotClock [55177：c07] liveGameList count = 1

STAssertEquals（[liveGameList count]，1，@“游戏列表必须包含一个唯一的实时游戏，但包含％@”，[liveGameList count]）; =＆GT;这使EXC_BAD_ACCESS上的测试崩溃。怎么了？

Answer 1

您的应用程序崩溃了，因为

  STAssertEquals([liveGameList count], 1,  @"The list of game must contain one unique live game but contain %@",[liveGameList count])

尝试将％@ formatter应用于[liveGameList count]的结果。但是％@期望一个Objective C对象，其中[liveGameList count]返回标量“1”。运行时将该标量转换为指向0x00000001的指针，并尝试使用它在那里找到的“对象”。但这不是一个有效的指针，因此运行时会引发无效的地址异常。

Answer 2

我认为STAssertEquals需要2个对象，你应该做类似

的事情

STAssertTrue([myArray count] == expectedCount, @"Count is wrong);

Objective-C NSArray，Block，STAssertEquals

2 个答案: