add tz describe test for df

Author: louispotok

pandas/tests/frame/test_analytics.py

@@ -417,6 +417,27 @@ def test_describe_timedelta_values(self):
                     "max           5 days 00:00:00         0 days 05:00:00")
         assert repr(res) == exp_repr
 
+    def test_describe_tz_values(self, tz_naive_fixture):
+        tz = tz_naive_fixture
+        s1 = Series(range(5))
+        start = Timestamp(2018, 1, 1)
+        end = Timestamp(2018, 1, 5)
+        s2 = Series(date_range(start, end, tz=tz))
+        df = pd.DataFrame({'s1': s1, 's2': s2})
+
+        expected = DataFrame({'s1': [5, np.nan, np.nan, np.nan, np.nan, np.nan,
+                                     2, 1.581139, 0, 1, 2, 3, 4],
+                              's2': [5, 5, s2.value_counts().index[0], 1,
+                                     start.tz_localize(tz),
+                                     end.tz_localize(tz), np.nan, np.nan,
+                                     np.nan, np.nan, np.nan, np.nan, np.nan]},
+                             index=['count', 'unique', 'top', 'freq', 'first',
+                                    'last', 'mean', 'std', 'min', '25%', '50%',
+                                    '75%', 'max']
+                             )
+        res = df.describe(include='all')
+        tm.assert_frame_equal(res, expected)
+
     def test_reduce_mixed_frame(self):
         # GH 6806
         df = DataFrame({