code: def test_dont_register_by_default(self):
      # Run in subprocess to ensure a clean state
      code = (
          "import matplotlib.units; "
          "import pandas as pd; "
          "units = dict(matplotlib.units.registry); "
          "assert pd.Timestamp not in units"
      )
      call = [sys.executable, "-c", code]
      assert subprocess.check_call(call) == 0
  
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 1 for calling the TestRegistration obj's underlying member method code with example usage: obj.test_dont_register_by_default() without return types