def METHOD_NAME(input_protdna_models):
    """Test focusing on the RMSD class."""
    params = {}
    rmsd_obj = RMSD(
        input_protdna_models,
        core=0,
        npairs=1,
        start_ref=0,
        start_mod=1,
        output_name="rmsd_0.matrix",
        path=Path("."),
        params=params
        )
    rmsd_obj.run()
    expected_data = np.array([[1, 2, 2.257]])
    np.testing.assert_allclose(rmsd_obj.data, expected_data, atol=0.001)