Add replace test for nil gh32075

Signed-off-by: Liang Yan <[email protected]>

Author: liang3zy22

pandas/tests/series/methods/test_replace.py

@@ -318,6 +318,13 @@ def test_replace_with_dictlike_and_string_dtype(self, nullable_string_dtype):
         result = ser.replace({"one": "1", "two": "2"})
         tm.assert_series_equal(expected, result)
 
+    def test_replace_with_nil_na(self):
+        # GH 32075
+        ser = pd.DataFrame({"a": ["nil", pd.NA]})
+        expected = pd.DataFrame({"a": ["anything else", pd.NA]}, index=[0, 1])
+        result = ser.replace("nil", "anything else")
+        tm.assert_frame_equal(expected, result)
+
     def test_replace_with_empty_dictlike(self):
         # GH 15289
         s = pd.Series(list("abcd"))