fixed error in test cases

Author: jcaoun

pandas/tests/scalar/timestamp/test_timezones.py

@@ -65,7 +65,7 @@ def test_tz_localize_pushes_out_of_bounds(self):
     def test_tz_localize_ambiguous_bool(self, unit):
         # make sure that we are correctly accepting bool values as ambiguous
         # GH#14402
-        ts = Timestamp("2015-11-01 01:00:03")._as_unit(unit)
+        ts = Timestamp("2015-11-01 01:00:03").as_unit(unit)
         expected0 = Timestamp("2015-11-01 01:00:03-0500", tz="US/Central")
         expected1 = Timestamp("2015-11-01 01:00:03-0600", tz="US/Central")
 
@@ -261,7 +261,7 @@ def test_timestamp_tz_localize_nonexistent_shift(
         tz = tz_type + tz
         if isinstance(shift, str):
             shift = "shift_" + shift
-        ts = Timestamp(start_ts)._as_unit(unit)
+        ts = Timestamp(start_ts).as_unit(unit)
         result = ts.tz_localize(tz, nonexistent=shift)
         expected = Timestamp(end_ts).tz_localize(tz)
 
@@ -290,15 +290,15 @@ def test_timestamp_tz_localize_nonexistent_shift_invalid(self, offset, tz_type):
     @pytest.mark.parametrize("unit", ["ns", "us", "ms", "s"])
     def test_timestamp_tz_localize_nonexistent_NaT(self, tz, unit):
         # GH 8917
-        ts = Timestamp("2015-03-29 02:20:00")._as_unit(unit)
+        ts = Timestamp("2015-03-29 02:20:00").as_unit(unit)
         result = ts.tz_localize(tz, nonexistent="NaT")
         assert result is NaT
 
     @pytest.mark.parametrize("tz", ["Europe/Warsaw", "dateutil/Europe/Warsaw"])
     @pytest.mark.parametrize("unit", ["ns", "us", "ms", "s"])
     def test_timestamp_tz_localize_nonexistent_raise(self, tz, unit):
         # GH 8917
-        ts = Timestamp("2015-03-29 02:20:00")._as_unit(unit)
+        ts = Timestamp("2015-03-29 02:20:00").as_unit(unit)
         msg = "2015-03-29 02:20:00"
         with pytest.raises(pytz.NonExistentTimeError, match=msg):
             ts.tz_localize(tz, nonexistent="raise")