fix pandas-dev#19970

Author: mroeschke

pandas/tests/frame/test_operators.py

@@ -992,6 +992,16 @@ def test_boolean_comparison(self):
         result = df == tup
         assert_frame_equal(result, expected)
 
+    @pytest.mark.parametrize('tz', [None, 'America/New_York'])
+    def test_boolean_compare_transpose_tzindex_with_dst(self, tz):
+        # GH 19970
+        idx = date_range('20161101', '20161130', freq='4H', tz=tz)
+        df = DataFrame({'a':range(len(idx)), 'b':range(len(idx))},
+                       index=idx)
+        result = df.T == df.T
+        expected = DataFrame(True, index=list('ab'), columns=idx)
+        assert_frame_equal(result, expected)
+
     def test_combine_generic(self):
         df1 = self.frame
         df2 = self.frame.loc[self.frame.index[:-5], ['A', 'B', 'C']]