def METHOD_NAME(res):
    """Tests evaluating single nuclide concentration."""
    t, n = res.get_mass("1", "Xe135")
    t_ref = np.array([0.0, 1296000.0, 2592000.0, 3888000.0])
    n_ref = np.array(
        [6.67473282e+08, 3.88942731e+14, 3.73091215e+14, 3.26987387e+14])
    # Get g
    n_ref *= openmc.data.atomic_mass('Xe135') / openmc.data.AVOGADRO
    np.testing.assert_allclose(t, t_ref)
    np.testing.assert_allclose(n, n_ref)
    # Check alternate units
    volume = res[0].volume["1"]
    t_days, n_cm3 = res.get_mass("1", "Xe135", mass_units="g/cm3", time_units="d")
    assert t_days == pytest.approx(t_ref / (60 * 60 * 24))
    assert n_cm3 == pytest.approx(n_ref / volume)
    t_min, n_bcm = res.get_mass("1", "Xe135", mass_units="kg", time_units="min")
    assert n_bcm == pytest.approx(n_ref * 1e3)
    assert t_min == pytest.approx(t_ref / 60)
    t_hour, _n = res.get_mass("1", "Xe135", time_units="h")
    assert t_hour == pytest.approx(t_ref / (60 * 60))