code: def test_parameters_pretty_repr(parameters):
      """Test the pretty_repr method."""
      pars, _, _ = parameters
      output = pars.pretty_repr()
      output_oneline = pars.pretty_repr(oneline=True)
  
      split_output = output.split("\n")
      assert len(split_output) == 5
      assert "Parameters" in split_output[0]
      assert "Parameter 'a'" in split_output[1]
      assert "Parameter 'b'" in split_output[2]
  
      oneliner = (
          "Parameters([('a', <Parameter 'a', value=10.0, "
          "bounds=[-100.0:100.0], brute_step=5.0>), ('b', <Parameter "
          "'b', value=20.0, bounds=[-250.0:250.0], expr='2.0*a', "
          "brute_step=25.0>)])"
      )
      assert output_oneline == oneliner
  
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 18 for calling a global function with example usage: test_parameters_pretty_repr(parameters) without return types