restore original test case

Author: minggli

pandas/tests/frame/test_to_csv.py

@@ -922,7 +922,7 @@ def test_to_csv_path_is_none(self):
     @pytest.mark.parametrize('frame, encoding', [
         (DataFrame([[0.123456, 0.234567, 0.567567],
                     [12.32112, 123123.2, 321321.2]],
-                   index=['A', 'B'], columns=['X', 'Y', 'Z']), 'utf-8'),
+                   index=['A', 'B'], columns=['X', 'Y', 'Z']), None),
         (DataFrame([['abc', 'def', 'ghi']], columns=['X', 'Y', 'Z']), 'ascii'),
         (DataFrame(5 * [[123, u"你好", u"世界"]],
                    columns=['X', 'Y', 'Z']), 'gb2312'),

pandas/tests/series/test_io.py

@@ -139,7 +139,7 @@ def test_to_csv_path_is_none(self):
 
     @pytest.mark.parametrize('s, encoding', [
         (Series([0.123456, 0.234567, 0.567567], index=['A', 'B', 'C'],
-                name='X'), 'utf-8'),
+                name='X'), None),
         (Series(['abc', 'def', 'ghi'], name='X'), 'ascii'),
         (Series(["123", u"你好", u"世界"], name=u"中文"), 'gb2312'),
         (Series(["123", u"Γειά σου", u"Κόσμε"], name=u"Ελληνικά"), 'cp737')