code: def test_save(self, tmpdir):
      ch = self.chart
      base_filename = "test_save"
      for filetype in ("png", "svg", "html"):
          filename = tmpdir.join(base_filename + "." + filetype)
          try:
              ch.save(filename=str(filename), format=filetype)
          # Occurs if chromedriver is not found
          except WebDriverException:
              pytest.skip("Skipping save tests")
  
file_path: chartify/tests/test_chart.py
imports: import chartify
  import numpy
  import pandas
  import pytest
  from selenium.common.exceptions import WebDriverException
label_desc: Use image node_id 3 for calling the TestChart obj's underlying member method code with example usage: obj.test_save(tmpdir) without return types