我正在使用OCMock测试从故事板中实例化的UIViewControllers。遵循最佳实践，视图控制器视图的所有IBOutlet子视图都是weak属性。当我为这些视图控制器编写测试，其中测试调用依赖于弱属性的方法时，我发现偶发的EXC_BAD_ACCESS崩溃就像我附加的那样。
每次单元测试运行都不会发生崩溃。似乎没有模式，碰撞表面是否完全随机。这种部分模拟视图控制器的设计技术也在应用程序的许多地方使用。
可能发生什么事？我在这里尝试做的事情是否存在冲突？
@interface CustomUIViewControllerTests : XCTestCase
@property (nonatomic, strong) CustomUIViewController *vc;
@property (nonatomic, strong) UIStoryboard *mainStoryboard;
@end
@implementation CustomUIViewControllerTests
- (void)setUp
{
[super setUp];
// In order to test data on the Storyboard - need to instantiate the Storyboard
self.mainStoryboard = [UIStoryboard storyboardWithName:[[NSBundle mainBundle].infoDictionary
objectForKey:@"UIMainStoryboardFile"]
bundle:[NSBundle mainBundle]];
self.vc = [_mainStoryboard instantiateViewControllerWithIdentifier:kStoryboardVCID];
[self.vc loadView];
}
- (void)testSomething
{
id mockController = [OCMockObject partialMockForObject:self.vc];
[mockController doSomethingThatUsesAWeakProperty];
//other verification/assertions here
}
崩溃：
Process: XXXX [33756]
Path: /Users/USER/Library/Application Support/iPhone Simulator/*/XXXX.app/XXXX
Identifier: XXXX
Version: 0
Code Type: X86-64 (Native)
Parent Process: launchd_sim [33727]
Responsible: launchd_sim [33727]
User ID: 501
Date/Time: 2014-07-10 11:51:51.692 -0400
OS Version: Mac OS X 10.9.3 (13D65)
Report Version: 11
Anonymous UUID: 8B81673C-B92D-28D3-9940-47C83C140C8E
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000011ab0e360
External Modification Warnings:
Debugger attached to process.
VM Regions Near 0x11ab0e360:
MALLOC_TINY 0000000114700000-0000000114800000 [ 1024K] rw-/rwx SM=PRV
-->
JS JIT generated code 0000056193e99000-0000056193e9a000 [ 4K] ---/rwx SM=NUL
Application Specific Information:
iPhone Simulator 463.9.41, iPhone OS 7.1 (iPhone Retina (4-inch 64-bit)/11D167)
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x0000000103156292 __kill + 10
1 XXXX 0x000000010010f565 CLSSignalHandler + 218 (CLSSignal.m:305)
2 libsystem_platform.dylib 0x00000001030295aa _sigtramp + 26
3 Foundation 0x0000000102174225 -[NSConcreteValue getValue:] + 29
4 Foundation 0x00000001021af5be -[NSValue nonretainedObjectValue] + 25
5 XXXX 0x0000000100153e00 +[OCPartialMockObject existingPartialMockForObject:] + 160 (OCPartialMockObject.m:50)
6 XXXX 0x00000001001546e1 -[OCPartialMockObject forwardingTargetForSelectorForRealObject:] + 65 (OCPartialMockObject.m:170)
7 CoreFoundation 0x0000000102a8ba5c ___forwarding___ + 156
8 CoreFoundation 0x0000000102a8b938 _CF_forwarding_prep_0 + 120
9 XXXX 0x0000000100028ea6 -[CustomUIViewController doSomethingThatUsesAWeakProperty] + 454 (CustomUIViewControllerTests.m:121)
10 CoreFoundation 0x0000000102a8ff1c __invoking___ + 140
11 CoreFoundation 0x0000000102a8fdc4 -[NSInvocation invoke] + 308
12 CoreFoundation 0x0000000102a8ff86 -[NSInvocation invokeWithTarget:] + 54
13 XXXX 0x0000000100154999 -[OCPartialMockObject handleUnRecordedInvocation:] + 73 (OCPartialMockObject.m:217)
14 XXXX 0x0000000100151fe6 -[OCMockObject forwardInvocation:] + 102 (OCMockObject.m:190)
15 CoreFoundation 0x0000000102a8bb85 ___forwarding___ + 453
16 CoreFoundation 0x0000000102a8b938 _CF_forwarding_prep_0 + 120
17 XXXXTests 0x000000010c0d289d -[CustomUIViewControllerTests testSomething] + 573 (CustomUIViewControllerTests.m:996)
18 CoreFoundation 0x0000000102a8ff1c __invoking___ + 140
19 CoreFoundation 0x0000000102a8fdc4 -[NSInvocation invoke] + 308
20 XCTest 0x0000000109ba4c40 -[XCTestCase invokeTest] + 161
21 XCTest 0x0000000109ba4d2c -[XCTestCase performTest:] + 91
22 XCTest 0x0000000109ba5a75 -[XCTest run] + 65
23 XCTest 0x0000000109ba44df -[XCTestSuite performTest:] + 125
24 XCTest 0x0000000109ba5a75 -[XCTest run] + 65
25 XCTest 0x0000000109ba44df -[XCTestSuite performTest:] + 125
26 XCTest 0x0000000109ba5a75 -[XCTest run] + 65
27 XCTest 0x0000000109ba44df -[XCTestSuite performTest:] + 125
28 XCTest 0x0000000109ba5a75 -[XCTest run] + 65
29 XCTest 0x0000000109ba71b4 +[XCTestProbe runTests:] + 138
30 Foundation 0x00000001021846dc __NSFireDelayedPerform + 354
31 CoreFoundation 0x0000000102a5cc34 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
32 CoreFoundation 0x0000000102a5c7b2 __CFRunLoopDoTimer + 962
33 CoreFoundation 0x0000000102a457be __CFRunLoopRun + 1614
34 CoreFoundation 0x0000000102a44d83 CFRunLoopRunSpecific + 467
35 GraphicsServices 0x00000001039dcf04 GSEventRunModal + 161
36 UIKit 0x00000001010cce33 UIApplicationMain + 1010
37 XXXX 0x000000010007b889 main + 169 (main.m:16)
38 libdyld.dylib 0x000000010301f5fd start + 1
答案 0 :(得分：0)
此处的问题必须与OCMock在创建partialMock时所执行的操作相关联。您可以查看源代码here。
你的ViewController的视图很可能被填满了，并且随之而来的是它的所有子视图（设置为出口）
但这很重要：通常你会模拟其他对象，而不是你正在测试的系统。如果你在嘲笑你的SUT，那么你可能需要重构你的代码。
话虽如此，我使用部分模拟来模拟SUT，例如从懒惰实例化的属性返回模拟对象，并且完全正常。