Hide stdout during tests

        const char *args[] = {"PotentialFileReaderTest", "-log", "none", "-echo", "screen", "-nocite" };

        char **argv = (char **)args;

        int argc = sizeof(args)/sizeof(char *);

        ::testing::internal::CaptureStdout();

        lmp = new LAMMPS(argc, argv, MPI_COMM_WORLD);

        ::testing::internal::GetCapturedStdout();

    }

    void TearDown() override {

        ::testing::internal::CaptureStdout();

        delete lmp;

        ::testing::internal::GetCapturedStdout();

    }

};

TEST_F(PotenialFileReaderTest, Si) {

    ::testing::internal::CaptureStdout();

    PotentialFileReader reader(lmp, "Si.sw", "Stillinger-Weber");

    ::testing::internal::GetCapturedStdout();

    auto line = reader.next_line(PairSW::Param::NPARAMS_PER_LINE);

    ASSERT_EQ(utils::count_words(line), PairSW::Param::NPARAMS_PER_LINE);

}

TEST_F(PotenialFileReaderTest, Comb) {

    ::testing::internal::CaptureStdout();

    PotentialFileReader reader(lmp, "ffield.comb", "COMB");

    ::testing::internal::GetCapturedStdout();

    auto line = reader.next_line(PairComb::Param::NPARAMS_PER_LINE);

    ASSERT_EQ(utils::count_words(line), PairComb::Param::NPARAMS_PER_LINE);

}

TEST_F(PotenialFileReaderTest, Comb3) {

    ::testing::internal::CaptureStdout();

    PotentialFileReader reader(lmp, "ffield.comb3", "COMB3");

    ::testing::internal::GetCapturedStdout();

    auto line = reader.next_line(PairComb3::Param::NPARAMS_PER_LINE);

    ASSERT_EQ(utils::count_words(line), PairComb3::Param::NPARAMS_PER_LINE);

}

TEST_F(PotenialFileReaderTest, Tersoff) {

    ::testing::internal::CaptureStdout();

    PotentialFileReader reader(lmp, "Si.tersoff", "Tersoff");

    ::testing::internal::GetCapturedStdout();

    auto line = reader.next_line(PairTersoff::Param::NPARAMS_PER_LINE);

    ASSERT_EQ(utils::count_words(line), PairTersoff::Param::NPARAMS_PER_LINE);

}