单元测试无法找到Core Data模型文件 [英] Unit Test can't find Core Data model file

问题描述

我已经创建了一个包含Core Data模型的项目。应用程序查找模型文件（.momd）并运行正常。

I've created a project with a Core Data model in it. The application looks for the model file (.momd) and runs just fine.

不幸的是，单元测试一直返回null：

Unfortunately, the unit test keeps returning null:

NSURL *dataModelURL = [[NSBundle mainBundle] URLForResource:@"myDataModel" withExtension:@"momd"];

我可以在主目标和单元测试目标的编译中看到myDataModel.xdatamodeld文件夹和文件源目录 - 但这似乎不够。我在单元测试目标中还缺少什么？

I can see the myDataModel.xdatamodeld folder and file in BOTH the main target and the unit testing target's Compile Sources directory - but that doesn't seem to be enough. What else am I missing in the unit test target?

谢谢，
-Luther

Thanks, -Luther

推荐答案

不幸的是，单元测试目标不使用应用程序的主bundle，但它会创建一个特殊的UnitTest-bundle。因此，如果您需要在测试中使用捆绑资源（如核心数据模型），则需要解决该问题。

Unfortunately, a unit test target does not use the application's main bundle but it creates a special UnitTest-bundle. So if you need to use bundled resources (like a Core Data model) within your tests, you need to work around that issue.

最简单，最灵活的解决方法是在测试代​​码中使用 bundle $ C> c> NSBundle 的 bundleForClass：方法。该方法的参数可以简单地通过测试中的 [self class] 给出。这样您就可以重用此代码而无需在多个项目中调整包标识符。

The most simple and most flexible workaround would be using the bundleForClass: method of NSBundle within your testing code. The parameter for that method can simply be given by [self class] within your tests. That way you can reuse this code without having to adjust the bundle identifiers in multiple projects.

示例：

- (void)testBundleLocation
{
    NSBundle *bundle = [NSBundle bundleForClass:[self class]];
    NSURL *url = [bundle URLForResource:@"myDataModel" withExtension:@"momd"];
    ...
}

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