TST (string dtype): replace string_storage fixture with explicit stor…

…age/na_value keyword arguments for dtype creation (pandas-dev#59375)

pandas/conftest.py

@@ -1262,6 +1262,24 @@ def string_storage(request):
  return request.param
 
 
+@pytest.fixture(
+ params=[
+ ("python", pd.NA),
+ pytest.param(("pyarrow", pd.NA), marks=td.skip_if_no("pyarrow")),
+ pytest.param(("pyarrow", np.nan), marks=td.skip_if_no("pyarrow")),
+ ]
+)
+def string_dtype_arguments(request):
+ """
+ Parametrized fixture for StringDtype storage and na_value.
+
+ * 'python' + pd.NA
+ * 'pyarrow' + pd.NA
+ * 'pyarrow' + np.nan
+ """
+ return request.param
+
+
 @pytest.fixture(
  params=[
  "numpy_nullable",

pandas/tests/arrays/string_/test_string.py

@@ -22,9 +22,10 @@
 
 
 @pytest.fixture
-def dtype(string_storage):
- """Fixture giving StringDtype from parametrized 'string_storage'"""
- return pd.StringDtype(storage=string_storage)
+def dtype(string_dtype_arguments):
+ """Fixture giving StringDtype from parametrized storage and na_value arguments"""
+ storage, na_value = string_dtype_arguments
+ return pd.StringDtype(storage=storage, na_value=na_value)
 
 
 @pytest.fixture

pandas/tests/extension/test_string.py

@@ -58,8 +58,9 @@ def chunked(request):
 
 
 @pytest.fixture
-def dtype(string_storage):
- return StringDtype(storage=string_storage)
+def dtype(string_dtype_arguments):
+ storage, na_value = string_dtype_arguments
+ return StringDtype(storage=storage, na_value=na_value)
 
 
 @pytest.fixture