Method CoutStream

extras/catch_amalgamated.cpp:4619–4619

Store the streambuf from cout up-front because cout may get redirected when running tests

            // Store the streambuf from cout up-front because
            // cout may get redirected when running tests
            CoutStream() : m_os( Catch::cout().rdbuf() ) {}

        public: // IStream
            std::ostream& stream() override { return m_os; }