Remove unused capsys variable in test method

Author: kinow

pandas/tests/io/formats/test_to_csv.py

@@ -539,7 +539,7 @@ def test_to_csv_compression(self, compression_only,
                                  compression=read_compression)
             tm.assert_frame_equal(result, df)
 
-    def test_to_csv_na_rep_long_string(self, capsys):
+    def test_to_csv_na_rep_long_string(self):
         # see gh-25099
         df = pd.DataFrame({"c": [float('nan')] * 3})
         df = df.astype("Int64")