尝试为FlockSwiftUtils添加测试。该项目没有UI，所以我不想有一个带有应用程序目标的项目。 Xcode确实将{None}设为目标Host Application，因此似乎可行。
目标构建成功，但是xctest失败，并显示错误
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xctest (41117) encountered an error (Early unexpected exit, operation never finished bootstrapping - no restart will be attempted. (Underlying error: The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch.))
从日志中：
13:35:05.753 Xcode[38272:7487908] Test operation failure: The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch.
13:35:05.753 Xcode[38272:7487908] _finishWithError:Error Domain=IDETestOperationsObserverErrorDomain Code=5 "The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch." UserInfo={NSLocalizedDescription=The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch.}
有关此代码，请参见tests branch FlockSwiftUtils。