string storage option not yet honored for NaN-variant

Author: jorisvandenbossche

pandas/tests/arrays/string_/test_string_arrow.py

@@ -4,6 +4,7 @@
 import numpy as np
 import pytest
 
+from pandas.compat import HAS_PYARROW
 import pandas.util._test_decorators as td
 
 import pandas as pd
@@ -26,7 +27,12 @@ def test_eq_all_na():
     tm.assert_extension_array_equal(result, expected)
 
 
-def test_config(string_storage, using_infer_string):
+def test_config(string_storage, request, using_infer_string):
+    if using_infer_string and string_storage == "python" and HAS_PYARROW:
+        # string storage with na_value=NaN always uses pyarrow if available
+        # -> does not yet honor the option
+        request.applymarker(pytest.mark.xfail(reason="TODO(infer_string)"))
+
     with pd.option_context("string_storage", string_storage):
         assert StringDtype().storage == string_storage
         result = pd.array(["a", "b"])