The Compartmented Robust Posix C++ Unit Test system. crpcut is a simple to use unit test system for C++, where each test case is run in its own process and own working directory, to ensure that each test case starts from a clean slate. -The Compartmented Robust Posix C++ Unit Test system. crpcut is a simple to use unit test system for C++, where each test case is run in its own process and own working directory, to ensure that each test case starts from a clean slate.