2013-03-08 76 views
1

我工作的应用程序列出了一项运动的当前现场比赛。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的现场比赛列表。然后,我必须从他们的身份证获取竞技场名称。当所有完成后,我发回一个NSArray包含一个现场比赛列表。Objective-C NSArray,Block,STAssertEquals

在测试我的解析方法传递NSArray通过块时,我在SenTestCase中发现了一个奇怪的方法。在我的测试中,我能够执行[myArray count]并将结果显示在NSLog中,但是当我使用EXC_BAD_ACCESS执行STAssertEquals([myArray count], 1, @"Error description")测试崩溃时。

这是我的代码减少到最低限度,并且其中我删除所有的网络方面:

#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 

的NSLog(@ “liveGameList计数=%d”,[liveGameList计数]); =>此行可以正常工作并打印: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独特的现场比赛,但包含%@“,[liveGameList计数]); =>这会使EXC_BAD_ACCESS上的测试崩溃。怎么了?

回答

1

你的应用程序崩溃,因为

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

尝试将%@格式适用于[liveGameList数]的结果。但%@期望一个Objective C对象,其中[liveGameList count]返回标量“1”。运行时将标量转换为指向0x00000001的指针,并尝试使用它在其中找到的“对象”。但这不是一个有效的指针,所以运行时会引发无效的地址异常。

+0

感谢您的快速回答。这很明显,但我完全专注于NSArray和Block,因为之前的错误。 – JonathanGailliez 2013-03-08 13:26:23

+0

非常自然!很容易忘记你的诊断可能是导致崩溃的原因! – 2013-03-08 13:35:46

0

我觉得STAssertEquals预计2个对象,你应该这样做

STAssertTrue([myArray count] == expectedCount, @"Count is wrong); 
+0

非常感谢。这有效地工作。另一个你让我想到的解决方案是用1U代替1: 'STAssertEquals([liveGameList count],1U,@“游戏列表必须包含一个独特的现场游戏,但包含%@”,[liveGameList count]); ' 我明白如果测试失败,但它会崩溃。有人有我的解释吗? 谢谢。 – JonathanGailliez 2013-03-08 13:07:12