code: def test_conversion(self, dtc):
      rs = dtc.convert(["2012-1-1"], None, None)[0]
      xp = dates.date2num(datetime(2012, 1, 1))
      assert rs == xp
  
      rs = dtc.convert("2012-1-1", None, None)
      assert rs == xp
  
      rs = dtc.convert(date(2012, 1, 1), None, None)
      assert rs == xp
  
      rs = dtc.convert("2012-1-1", None, None)
      assert rs == xp
  
      rs = dtc.convert(Timestamp("2012-1-1"), None, None)
      assert rs == xp
  
      # also testing datetime64 dtype (GH8614)
      rs = dtc.convert("2012-01-01", None, None)
      assert rs == xp
  
      rs = dtc.convert("2012-01-01 00:00:00+0000", None, None)
      assert rs == xp
  
      rs = dtc.convert(
          np.array(
              ["2012-01-01 00:00:00+0000", "2012-01-02 00:00:00+0000"]
          ),
          None,
          None,
      )
      assert rs[0] == xp
  
      # we have a tz-aware date (constructed to that when we turn to utc it
      # is the same as our sample)
      ts = (
          Timestamp("2012-01-01")
          .tz_localize("UTC")
          .tz_convert("US/Eastern")
      )
      rs = dtc.convert(ts, None, None)
      assert rs == xp
  
      rs = dtc.convert(ts.to_pydatetime(), None, None)
      assert rs == xp
  
      rs = dtc.convert(Index([ts - Day(1), ts]), None, None)
      assert rs[1] == xp
  
      rs = dtc.convert(
          Index([ts - Day(1), ts]).to_pydatetime(), None, None
      )
      assert rs[1] == xp
  
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 3 for calling the TestDateTimeConverter obj's underlying member method code with example usage: obj.test_conversion(dtc) without return types