code: def test_astype_from_object_to_timedelta_unit(self, unit):
      vals = [
          ["1 Day", "2 Days", "3 Days"],
          ["4 Days", "5 Days", "6 Days"],
      ]
      df = DataFrame(vals, dtype=object)
      msg = (
          r"Cannot convert from timedelta64\[ns\] to timedelta64\[.*\]. "
          "Supported resolutions are 's', 'ms', 'us', 'ns'"
      )
      with pytest.raises(ValueError, match=msg):
          # TODO: this is ValueError while for DatetimeArray it is TypeError;
          #  get these consistent
          df.astype(f"m8[{unit}]")
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, CategoricalDtype, DataFrame, DatetimeTZDtype, Index, Interval, IntervalDtype, NaT, Series, Timedelta, Timestamp, concat, date_range, option_context
  import pandas._testing
label_desc: Use image node_id 20 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_from_object_to_timedelta_unit(unit) without return types