class_docstr: Casting to and from ExtensionDtypes
code: def test_astype_string(self, data, nullable_string_dtype):
      # GH-33465, GH#45326 as of 2.0 we decode bytes instead of calling str(obj)
      result = pd.Series(data[:5]).astype(nullable_string_dtype)
      expected = pd.Series(
          [
              str(x) if not isinstance(x, bytes) else x.decode()
              for x in data[:5]
          ],
          dtype=nullable_string_dtype,
      )
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/extension/base/casting.py
imports: import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  import pandas._testing
  from pandas.core.internals.blocks import NumpyBlock
label_desc: Use image node_id 5 for calling the BaseCastingTests obj's underlying member method code with example usage: obj.test_astype_string(data, nullable_string_dtype) without return types