code: def test_parameters_add_many():
      """Tests for add_many method."""
      a = lmfit.Parameter("a", 1)
      b = lmfit.Parameter("b", 2)
  
      par = lmfit.Parameters()
      par.add_many(a, b)
  
      par_with_tuples = lmfit.Parameters()
      par_with_tuples.add_many(("a", 1), ("b", 2))
  
      assert list(par.keys()) == ["a", "b"]
      assert par == par_with_tuples
  
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 23 for calling a global function with example usage: test_parameters_add_many() without return types