Sometimes when you are checking your solution by printing out each one of the instrutions make the buffer to get full. That is why the system tells it is timed out. Same thing happened to me, so I deleted the cout. All the problem got fixed.

'alr approved some time ago'

I did the same and it timed out.

Done

One more thing: it's std::size_t.

Alright, I've moved srand() so it should only be called once per test run.

srand should be called once, otherwise there's no real randomness.
And it's std::srand, std::rand, std::time; and std::rand is declared in cstdlib.

Done and done.

ps: I swapped the order of the arguments as per your previous comment!

The seed of rand isn't initialized.
The arguments of Assert::That in random tests are in the wrong order.

First time attempting a translation, so thanks for the pointers, Unnamed. I've edited the code accordingly. Let me know if there's anything else.

#define rot13 solution works. Move solution into random_tests or undef rot13.
Missing includes in the tests and in the solution.
solution is called after rot13 with the same string, which may have been changed by rot13 (&/&& overload + const_cast). Although nobody will probably do this in such a simple kata, it's still better to call reference solutions first.

C++ translation available. Please review and approve.

Hah, this just made my day!

Thanks, I didn't realise it showed console output. I feel rather stupid right now, heh.

std::cout your inputs.