TST: add test for non UTC datetime split #14042 (#32866)

Author: JDkuba

pandas/tests/indexes/datetimes/test_datetime.py

@@ -425,3 +425,11 @@ def test_index_map(self, name):
             ((2018,), range(1, 7)), names=[name, name]
         )
         tm.assert_index_equal(index, exp_index)
+
+    def test_split_non_utc(self):
+        # GH 14042
+        indices = pd.date_range("2016-01-01 00:00:00+0200", freq="S", periods=10)
+        result = np.split(indices, indices_or_sections=[])[0]
+        expected = indices.copy()
+        expected._set_freq(None)
+        tm.assert_index_equal(result, expected)