如何在匿名命名空间中使用google test和免费功能？

Question

I have a class that does a number of things. In order to split work into logical units, I've created a number of free functions in the anonymous namespace, as they're only used in this class.

I'm currently using gtest to unit test my classes. How can I implement unit tests for my anon namespace free functions?

Answer 1

First of all, you should not have functions in an anonymous namespace in a header.

That means, you want to unit test your functions in an anonymous namespace in source file.

The simplest answer is : you can't and don't those functions, since they are only available to the source file (translation unit) where they are defined.

However, you could call methods and functions, calling those functions, and test their outputs.

Another option is to move them out of anonymous namespace, and declare in the header. Then you can use some kind of unique namespace. For example :

// header

int someFunc();

namespace hidden {
float myFunc1(int);
}

Answer 2

Google suggests including the .cpp file in the test. I think it's a small price to pay to keep my source code clean.

Answer 3

No one can access your function in anonymous namespace out of .cpp, so if you really need to test your function, put these functions a subtle namespace or something like that. reference implement in chrome

namespace xxx {
namespace subtle {
   your help functions..
}
}