[boost] Preferred way to simulate system calls

Subject: [boost] Preferred way to simulate system calls
From: James E. King, III (jking_at_[hidden])
Date: 2017-11-06 22:00:41

I like to test every branch, and I have a class that calls
open/read/close.  It uses a hardcoded filename ("/dev/urandom").  It is a
template in a detail namespace.  What's the "boost way" when it comes to
mocking these system calls?  Should I make protected methods that normally
call open/read/close, then subclass in a test and  override them with
different logic to force error paths?

- Jim