paramterize test

Author: yuanx749

pandas/tests/series/methods/test_convert_dtypes.py

@@ -300,17 +300,13 @@ def test_convert_dtypes_pyarrow_null(self):
         tm.assert_series_equal(result, expected)
 
     @td.skip_if_no("pyarrow")
-    def test_convert_empty_categorical_to_pyarrow(self):
+    @pytest.mark.parametrize("categories", [None, ["S1", "S2"]])
+    def test_convert_empty_categorical_to_pyarrow(self, categories):
         # GH#59934
-        ser1 = pd.Series(pd.Categorical([None] * 5))
-        converted1 = ser1.convert_dtypes(dtype_backend="pyarrow")
-        expected = ser1
-        tm.assert_series_equal(converted1, expected)
-
-        ser2 = pd.Series(pd.Categorical([None] * 5, categories=["S1", "S2"]))
-        converted2 = ser2.convert_dtypes(dtype_backend="pyarrow")
-        expected = ser2
-        tm.assert_series_equal(converted2, expected)
+        ser = pd.Series(pd.Categorical([None] * 5, categories=categories))
+        converted = ser.convert_dtypes(dtype_backend="pyarrow")
+        expected = ser
+        tm.assert_series_equal(converted, expected)
 
     def test_convert_dtype_pyarrow_timezone_preserve(self):
         # GH 60237