def METHOD_NAME(self):
    """Create A-atom potential for a Fe-Cu-Ni eam/alloy potential at equicomposition
    The input potential is from Ref. [1]_ and was downloaded from
    the NIST database [2]_. The generated The generated A-atom
    potential is compared to a reference A-atom potential, which
    was created with an independent implementation. This is not
    a very strong test, but should capture some regressions.
    References
    ----------
    [1] G. Bonny, R.C. Pasianot, N. Castin, and L. Malerba (2009), 
        "Ternary Fe-Cu-Ni many-body potential to model reactor 
        pressure vessel steels: First validation by simulated 
        thermal annealing", Philosophical Magazine, 89(34-36), 
        3531-3546. DOI: 10.1080/14786430903299824.
    [2] https://www.ctcms.nist.gov/potentials/Download/2009--Bonny-G-Pasianot-R-C-Castin-N-Malerba-L--Fe-Cu-Ni/1/FeCuNi.eam.alloy
    """
    input_table = "FeCuNi.eam.alloy"
    reference_table = "FeCuNi_reference_A-atom_Fe33Cu33Ni33.eam.alloy"
    concentrations = np.array((1.0 / 3.0, 1.0 / 3.0, 1.0 / 3.0))
    source, parameters, F, f, rep = io.read_eam(input_table)
    (new_parameters, new_F, new_f, new_rep) = average_atom.average_potential(
        concentrations, parameters, F, f, rep
    )
    ref_source, ref_parameters, ref_F, ref_f, ref_rep = io.read_eam(reference_table)
    diff_F = np.linalg.norm(ref_F - new_F)
    diff_f = np.linalg.norm(ref_f - new_f)
    diff_rep = np.linalg.norm(ref_rep - new_rep)
    print(diff_F, diff_f, diff_rep)
    self.assertTrue(diff_F < self.tol)
    self.assertTrue(diff_f < self.tol)
    self.assertTrue(diff_rep < self.tol)