Fix+test timezone-preservation in DTA.repeat

Author: jbrockmendel

pandas/core/arrays/datetimelike.py

@@ -698,7 +698,7 @@ def repeat(self, repeats, *args, **kwargs):
         """
         nv.validate_repeat(args, kwargs)
         values = self._data.repeat(repeats)
-        return type(self)(values, dtype=self.dtype)
+        return type(self)._simple_new(values, dtype=self.dtype)
 
     # ------------------------------------------------------------------
     # Null Handling

pandas/tests/arrays/test_datetimes.py

@@ -90,3 +90,10 @@ def test_setitem_clears_freq(self):
                                         tz='US/Central'))
         a[0] = pd.Timestamp("2000", tz="US/Central")
         assert a.freq is None
+
+    def test_repeat_preserves_tz(self):
+        dti = pd.date_range('2000', periods=2, freq='D', tz='US/Central')
+        arr = DatetimeArray(dti)
+
+        repeated = arr.repeat([1, 1])
+        tm.assert_equal(arr, repeated)