code: def test_add_strings(dtype):
      arr = pd.array(["a", "b", "c", "d"], dtype=dtype)
      df = pd.DataFrame([["t", "y", "v", "w"]], dtype=object)
      assert arr.__add__(df) is NotImplemented
  
      result = arr + df
      expected = pd.DataFrame([["at", "by", "cv", "dw"]]).astype(dtype)
      tm.assert_frame_equal(result, expected)
  
      result = df + arr
      expected = pd.DataFrame([["ta", "yb", "vc", "wd"]]).astype(dtype)
      tm.assert_frame_equal(result, expected)
  
imports: import operator
  import numpy
  import pytest
  from pandas.compat.pyarrow import pa_version_under12p0
  from pandas.core.dtypes.common import is_dtype_equal
  import pandas
  import pandas._testing
  from pandas.core.arrays.string_arrow import ArrowStringArray, ArrowStringArrayNumpySemantics
label_desc: Use image node_id 14 for calling a global function with example usage: test_add_strings(dtype) without return types