code: def test_html_symbols(es, tmp_path):
      output_path_template = str(tmp_path.joinpath("test{}.png"))
      value = IdentityFeature(es["log"].ww["value"])
      gt = value > 5
      lt = value < 5
      ge = value >= 5
      le = value <= 5
  
      for i, feat in enumerate([gt, lt, ge, le]):
          output_path = output_path_template.format(i)
          graph = graph_feature(feat, to_file=output_path).source
          assert os.path.isfile(output_path)
          assert feat.get_name() in graph
  
imports: import json
  import os
  import re
  import graphviz
  import pytest
  from featuretools.feature_base import AggregationFeature, DirectFeature, FeatureOutputSlice, GroupByTransformFeature, IdentityFeature, TransformFeature, graph_feature
  from featuretools.primitives import Count, CumMax, Mode, NMostCommon, Year
label_desc: Use image node_id 8 for calling a global function with example usage: test_html_symbols(es, tmp_path) without return types