How to capture stdout/stderr with googletest?

Question

Is it possible to capture the stdout and stderr when using the googletest framework?

For example, I would like to call a function that writes errors to the console (

Answer 1

Rather than do this, use dependency injection to remove the direct use of std::cout. In your test code use a mock object of class std:ostringstream as a mock object instead of the real std::cout.

So instead of this:

 void func() {
    ...
    std::cout << "message";
    ...
 }

 int main (int argc, char **argv) {
    ...
    func();
    ...
 }

have this:

 void func(std::ostream &out) {
    ...
    out << "message";
    ...
 }

 int main(int argc, char **argv) {
    ...
    func(std::cout);
    ...
 }