code: def test_matplotlib_formatters(self):
      units = pytest.importorskip("matplotlib.units")
  
      # Can't make any assertion about the start state.
      # We we check that toggling converters off removes it, and toggling it
      # on restores it.
  
      with cf.option_context(
          "plotting.matplotlib.register_converters", True
      ):
          with cf.option_context(
              "plotting.matplotlib.register_converters", False
          ):
              assert Timestamp not in units.registry
          assert Timestamp in units.registry
  
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 4 for calling the TestRegistration obj's underlying member method code with example usage: obj.test_matplotlib_formatters() without return types