Remove unused capsys variable in test method

Author: kinow

pandas/tests/io/formats/test_to_csv.py

@@ -518,7 +518,7 @@ def test_to_csv_compression(self, compression_only, read_infer, to_infer):
             result = pd.read_csv(path, index_col=0, 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")