code: def test_dump_load_parameters(parameters):
      """Test for dump and load methods for a Parameters class."""
      pars, _, _ = parameters
  
      with open("parameters.sav", "w") as outfile:
          pars.dump(outfile)
  
      with open("parameters.sav") as infile:
          newpars = pars.load(infile)
  
      assert newpars == pars
      newpars["a"].value = 100.0
      assert_allclose(newpars["b"].value, 200.0)
  
imports: from copy import copy, deepcopy
  import os
  import pickle
  import numpy
  from numpy.testing import assert_allclose
  import pytest
  import lmfit
  from lmfit.models import VoigtModel
label_desc: Use image node_id 26 for calling a global function with example usage: test_dump_load_parameters(parameters) without return types