update tests to reflect expected behaviour

Author: minggli

pandas/tests/frame/test_alter_axes.py

@@ -748,8 +748,10 @@ def test_reset_index_name(self):
         df = DataFrame([[1, 2, 3, 4], [5, 6, 7, 8]],
                        columns=['A', 'B', 'C', 'D'],
                        index=Index(range(2), name='x'))
-        assert df.reset_index().index.name == 'x'
-        assert df.reset_index(drop=True).index.name == 'x'
+        assert df.reset_index().index.name is None
+        assert df.reset_index(drop=True).index.name is None
+        df.reset_index(inplace=True)
+        assert df.index.name is None
 
     def test_reset_index_level(self):
         df = DataFrame([[1, 2, 3, 4], [5, 6, 7, 8]],

pandas/tests/series/test_alter_axes.py

@@ -146,8 +146,8 @@ def test_reset_index(self):
 
     def test_reset_index_name(self):
         s = Series([1, 2, 3], index=Index(range(3), name='x'))
-        assert s.reset_index().index.name == 'x'
-        assert s.reset_index(drop=True).index.name == 'x'
+        assert s.reset_index().index.name is None
+        assert s.reset_index(drop=True).index.name is None
 
     def test_reset_index_level(self):
         df = DataFrame([[1, 2, 3], [4, 5, 6]],