update the kim_interactions command test

    ASSERT_GE(ifix, 0);

}

TEST_F(KimCommandsTest, kim_interactions_ar)

TEST_F(KimCommandsTest, kim_interactions)

{

    if (!LAMMPS::is_installed_pkg("KIM")) GTEST_SKIP();

    TEST_FAILURE(".*ERROR: Illegal kim_interactions command.*",

                 lmp->input->one("kim_interactions"););

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

    lmp->input->one("kim_init LennardJones_Ar real");

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

    TEST_FAILURE(".*ERROR: Must use 'kim_interactions' command "

                 "after simulation box is defined.*",

                 lmp->input->one("kim_interactions Ar"););

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

    lmp->input->one("kim_init LennardJones_Ar real");

    lmp->input->one("lattice fcc 4.4300");

    lmp->input->one("region box block 0 10 0 10 0 10");

    lmp->input->one("create_box 1 box");

    lmp->input->one("create_atoms 1 box");

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

    TEST_FAILURE(".*ERROR: Illegal kim_interactions command.*",

                 lmp->input->one("kim_interactions Ar Ar"););

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

    lmp->input->one("clear");

    lmp->input->one("lattice fcc 4.4300");

    lmp->input->one("region box block 0 10 0 10 0 10");

    lmp->input->one("create_box 1 box");

    lmp->input->one("create_atoms 1 box");

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

    TEST_FAILURE(".*ERROR: Must use 'kim_init' before 'kim_interactions'.*",

                 lmp->input->one("kim_interactions Ar"););

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

    lmp->input->one("clear");

    lmp->input->one("kim_init LennardJones_Ar real");

    lmp->input->one("lattice fcc 4.4300");

    lmp->input->one("region box block 0 10 0 10 0 10");

    lmp->input->one("create_box 1 box");

    lmp->input->one("create_atoms 1 box");

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

    TEST_FAILURE(".*ERROR: fixed_types cannot be used with a KIM Portable Model.*",

                 lmp->input->one("kim_interactions fixed_types"););

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

    lmp->input->one("clear");

    lmp->input->one("units real");

    lmp->input->one("pair_style kim LennardJones_Ar");

    lmp->input->one("region box block 0 1 0 1 0 1");

    lmp->input->one("create_box 4 box");

    lmp->input->one("pair_coeff * * Ar Ar Ar Ar");

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

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

    lmp->input->one("clear");

    lmp->input->one("kim_init Sim_LAMMPS_LJcut_AkersonElliott_Alchemy_PbAu metal");

    lmp->input->one("lattice fcc 4.920");

    lmp->input->one("region box block 0 10 0 10 0 10");

    lmp->input->one("create_box 1 box");

    lmp->input->one("create_atoms 1 box");

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

    TEST_FAILURE(".*ERROR: Species 'Ar' is not supported by this KIM Simulator Model.*",

                 lmp->input->one("kim_interactions Ar"););

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

    lmp->input->one("clear");

    lmp->input->one("kim_init LennardJones_Ar real");

    lmp->input->one("lattice fcc 4.4300");

    lmp->input->one("region box block 0 10 0 10 0 10");