GHUnit在回调块中运行断言而不是在前端显示错误时崩溃

Question

在回调中使用任何断言都会导致GH单元应用程序崩溃。断言在其他地方也很有效。

这里还有一个类似的问题：为什么GHUnit中异步测试中的错误断言会导致应用程序崩溃，而不仅仅是测试失败？

但我不明白如何在我的情况下使用这个解决方案。

- (void)testLoadMyProfile {
    void(^successCallback)(NSString*);
    successCallback = ^(NSString* response) {
        NSRange textRange;
        textRange =[[response lowercaseString] rangeOfString:[@"syntactically incorrect" lowercaseString]];
        if(textRange.location != NSNotFound) {
            GHFail(@"the request was syntactically incorrect");
        }
        NSDictionary *d;        
        @try {
            d = [response JSONValue];    
        } @catch (NSException *exception) {
            GHAssertNotNil(d, @"The response was not a valid JSONValue");
        }
        GHAssertNotNil([d objectForKey:@"memberId"], @"memberId wasn't in response");
        GHAssertNotNil([d objectForKey:@"profile"], @"profile wasn't in response");
        GHAssertNotNil([d objectForKey:@"name"], @"profile wasn't in response");
        GHAssertNotNil([d objectForKey:@"surnamez"], @"profile wasn't in response");
    };
    void(^errorCallback)(NSString*);
    errorCallback = ^(NSString* response) {
        GHFail(@"the error callback was called");
    };    
    // this is using ASIHTTPRequest to retrieve data
    [[RestAPIConnector sharedInstance] loadMyProfile:successCallback :errorCallback];
}

我可以通过覆盖这个方法来阻止应用程序崩溃——我甚至可以记录异常，但测试在前端不会显示为失败。理想情况下，我希望它能显示在前端，这样非技术人员就可以运行测试，并看到一切正常。

- (void)failWithException:(NSException *)exception {
}

Answer 1

您应该更改Status以停止块运行循环，查看我的评论：（对不起我的英语不好）

首先，您必须为GHAsyncTestCase创建子类

-(void)testGetRequest{
    [self prepare]; //prepare for hook the run loop
    PLRequest *req=[PLRequest requestWithURL:[NSURL URLWithString:@"http://m.baidu.com"]];
    req.finishCallback=^(PLRequest *req){
        NSData *d=req.respondData;
        NSString *s=[NSString stringWithUTF8String:[d bytes]];
        GHTestLog(@"Finish:%@", s);
        [self notify:kGHUnitWaitStatusSuccess]; //here to return
    };
    [req start];
    [self waitForStatus:kGHUnitWaitStatusSuccess timeout:15]; //wait for your block change Status then if timeout you will get a 'crash'
}

Answer 2

这里的答案（您所指的）也应该适用于您。

因此，您应该像Travis之前提到的那样实现GHAsyncTestCase。有了Async基类，就可以使用waitForStatus:timeout:和相应的notify:forSelector:方法。所有断言都需要在waitForStatus:timeout:之后完成。此方法暂停运行循环，并等待回调完成。

如果您需要更多关于异步测试的信息，请查看GHUnit的示例。

所以在你的情况下，我会尝试这样的方法：

- (void)testLoadMyProfile {
//Local variable for later assertion. __block is necessary to use the variable in the block.  
__block NSDictionary *d = nil;  
//Preparing.  
[self prepare];
void(^successCallback)(NSString*);
successCallback = ^(NSString* response) {
    NSRange textRange;
    textRange =[[response lowercaseString] rangeOfString:[@"syntactically incorrect" lowercaseString]];
    if(textRange.location != NSNotFound) {
        GHFail(@"the request was syntactically incorrect");
    }
    // Declared before.
    // NSDictionary *d;
    @try {
        d = [response JSONValue];    
    } @catch (NSException *exception) {
        // We'll check that later.
        // GHAssertNotNil(d, @"The response was not a valid JSONValue");
    }
    // Later.
    //GHAssertNotNil([d objectForKey:@"memberId"], @"memberId wasn't in response");
    //GHAssertNotNil([d objectForKey:@"profile"], @"profile wasn't in response");
    //GHAssertNotNil([d objectForKey:@"name"], @"profile wasn't in response");
    //GHAssertNotNil([d objectForKey:@"surnamez"], @"profile wasn't in response");
    // we notify ourself that we are done. selector should point to this method!  
   [self notify:kGHUnitWaitStatusSuccess forSelector:@selector(testLoadMyProfile)];  
};
void(^errorCallback)(NSString*);
errorCallback = ^(NSString* response) {
    GHFail(@"the error callback was called");
    // in this case we do notify ourself that the request failed.  
   [self notify:kGHUnitWaitStatusFailure forSelector:@selector(testLoadMyProfile)];
};    
[[RestAPIConnector sharedInstance] loadMyProfile:successCallback :errorCallback];
// This line pauses the runloop for the length of the timeout
[self waitForStatus:kGHUnitWaitStatusSuccess timeout:10.0];
// And finally after this line you can do your assertions. As the code pauses until you notify it or the timeout fires.
GHAssertNotNil(d, @"The response was not a valid JSONValue");
GHAssertNotNil([d objectForKey:@"memberId"], @"memberId wasn't in response");
GHAssertNotNil([d objectForKey:@"profile"], @"profile wasn't in response");
GHAssertNotNil([d objectForKey:@"name"], @"profile wasn't in response");
GHAssertNotNil([d objectForKey:@"surnamez"], @"profile wasn't in response");
}

因此，异步测试的所有断言都需要在waitForStatus:timeout:之后完成。别忘了notify:forSelector。