code: def __enter__(self):
      # The baseline images are created in this locale, so we should use
      # it during all of the tests.
      try:
          locale.setlocale(locale.LC_ALL, "en_US.UTF-8")
      except locale.Error:
          try:
              locale.setlocale(
                  locale.LC_ALL, "English_United States.1252"
              )
          except locale.Error:
              warnings.warn(
                  "Could not set locale to English/United States. "
                  "Some date-related tests may fail"
              )
  
      # make sure we don't carry over bad plots from former tests
      plt.close("all")
      n_figs = len(plt.get_fignums())
      msg = (
          f"No. of open figs: {n_figs}. Make sure the "
          "figures from the previous tests are cleaned up."
      )
      assert n_figs == 0, msg
  
      mpl.use("Agg")
      # These settings *must* be hardcoded for running the comparison
      # tests
      mpl.rcdefaults()  # Start with all defaults
      mpl.rcParams["text.hinting"] = "auto"
      mpl.rcParams["text.antialiased"] = True
      mpl.rcParams["text.hinting_factor"] = 8
      return self
  
imports: import inspect
  import locale
  import shutil
  import types
  import warnings
  from copy import deepcopy
  from pathlib import Path
  import matplotlib
  import matplotlib.pyplot
  from matplotlib.testing.compare import compare_images
  from plotnine import ggplot, theme
label_desc: Use image node_id 1 for calling the _test_cleanup obj's underlying member method code with example usage: obj.__enter__() and returns: self