code: def test_registry_resets(self):
      units = pytest.importorskip("matplotlib.units")
      dates = pytest.importorskip("matplotlib.dates")
  
      # make a copy, to reset to
      original = dict(units.registry)
  
      try:
          # get to a known state
          units.registry.clear()
          date_converter = dates.DateConverter()
          units.registry[datetime] = date_converter
          units.registry[date] = date_converter
  
          register_matplotlib_converters()
          assert units.registry[date] is not date_converter
          deregister_matplotlib_converters()
          assert units.registry[date] is date_converter
  
      finally:
          # restore original stater
          units.registry.clear()
          for k, v in original.items():
              units.registry[k] = v
  
imports: from datetime import date, datetime
  import subprocess
  import sys
  import numpy
  import pytest
  import pandas._config.config
  from pandas._libs.tslibs import to_offset
  from pandas import Index, Period, PeriodIndex, Series, Timestamp, arrays, date_range
  import pandas._testing
  from pandas.plotting import deregister_matplotlib_converters, register_matplotlib_converters
  from pandas.tseries.offsets import Day, Micro, Milli, Second
label_desc: Use image node_id 6 for calling the TestRegistration obj's underlying member method code with example usage: obj.test_registry_resets() without return types