code: def test_tz_localize_to_utc_ambiguous_infer(self):
      # val is a timestamp that is ambiguous when localized to US/Eastern
      val = 1_320_541_200_000_000_000
      vals = np.array([val, val - 1, val], dtype=np.int64)
  
      with pytest.raises(
          pytz.AmbiguousTimeError, match="2011-11-06 01:00:00"
      ):
          tz_localize_to_utc(
              vals, pytz.timezone("US/Eastern"), ambiguous="infer"
          )
  
      with pytest.raises(
          pytz.AmbiguousTimeError, match="are no repeated times"
      ):
          tz_localize_to_utc(
              vals[:1], pytz.timezone("US/Eastern"), ambiguous="infer"
          )
  
      vals[1] += 1
      msg = "There are 2 dst switches when there should only be 1"
      with pytest.raises(pytz.AmbiguousTimeError, match=msg):
          tz_localize_to_utc(
              vals, pytz.timezone("US/Eastern"), ambiguous="infer"
          )
  
imports: import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs.tzconversion import tz_localize_to_utc
label_desc: Use image node_id 1 for calling the TestTZLocalizeToUTC obj's underlying member method code with example usage: obj.test_tz_localize_to_utc_ambiguous_infer() without return types