code: def test_report_expression_parameter(fitresult):
      """Verify that a parameter with expression is shown correctly."""
      report_split = fitresult.fit_report().split("\n")
      indices = [
          i
          for i, val in enumerate(report_split)
          if "fwhm" in val or "height" in val
      ]
      for indx in indices:
          assert "==" in report_split[indx]
  
      html_params = fitresult.params._repr_html_()
      assert "expression" in html_params
  
imports: import numpy
  import pytest
  import lmfit
  from lmfit import Minimizer, Parameters, ci_report, conf_interval, fit_report, report_ci, report_fit
  from lmfit.lineshapes import gaussian
  from lmfit.models import GaussianModel
  from lmfit.printfuncs import alphanumeric_sort, correl_table, fitreport_html_table, getfloat_attr, gformat
label_desc: Use image node_id 19 for calling a global function with example usage: test_report_expression_parameter(fitresult) without return types