Xcode中的单元测试，是否运行应用程序？ [英] Unit Testing in Xcode, does it run the app?

问题描述

我遇到了一个我之前没遇到过的奇怪问题。

I'm running into a strange problem that I haven't run into before.

当您执行cmd + U运行单元测试时（例如OCUnit）它实际上是否调用main.m，新增了appDelegate并运行应用程序，就像你按下了cmd + R一样？

When you do cmd+U to run your Unit Tests (OCUnit for example) does it actually call the main.m, new up the appDelegate and run the app as if your had pressed cmd+R?

我只是问，因为我在这个DataLayer后面使用了CoreData。我在我的测试中成功地模拟了DataLayer，但是一旦我实现了一个实际调用CoreData的getAll方法，app / xcode抛出一个关于托管对象模型的异常不能为零。我明白了，但是我并没有意义实际创建DataLayer类，我在mainviewcontroller loadView方法中设置了一个断点，它调用了DataLayer getAll方法。它应该与测试无关，因为它是一个模拟对象，但它显然是在调用真实实例。

I only ask because I'm using CoreData behind this DataLayer. I'm mocking out the DataLayer successfully in my tests, but once I implemented a getAll method that is actually calling CoreData, the app/xcode is throwing an exception about the managed object model can't be nil. Which I understand, but I'm not meaning to actually new up the DataLayer class, and I've put a break point in my mainviewcontroller loadView method where it is calling the DataLayer getAll method. It shouldn't matter with tests because this is a mock object, but it's apparently calling the real instance.

所以回到我的问题，当按下cmd + U时它还运行应用程序然后运行测试？

So back to my question, when pressing cmd+U does it also run the app first then run the tests?

推荐答案

应用程序实际运行但有一个技巧可以用来防止它来自于运行。

The application is actually run but there is a trick you can use to prevent it from running.

int main(int argc, char* argv[]) {
    int returnValue;

    @autoreleasepool {
        BOOL inTests = (NSClassFromString(@"SenTestCase") != nil
                     || NSClassFromString(@"XCTest") != nil);    

        if (inTests) {
            //use a special empty delegate when we are inside the tests
            returnValue = UIApplicationMain(argc, argv, nil, @"TestsAppDelegate");
        }
        else {
            //use the normal delegate 
            returnValue = UIApplicationMain(argc, argv, nil, @"AppDelegate");
        }
    }

    return returnValue;
}

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