datetime64 series and dataframe test GH#28273

Signed-off-by: Liang Yan <[email protected]>

Author: liang3zy22

pandas/tests/arithmetic/test_datetime64.py

@@ -1221,6 +1221,10 @@ def test_dt64_mul_div_numeric_invalid(self, one, dt64_series, box_with_array):
         with pytest.raises(TypeError, match=msg):
             one / obj
 
+    def test_dt64_series_dataframe(self):
+        ser = Series([np.datetime64("2000-01-01")], dtype=object)
+        tm.assert_equal(ser.iloc[0], ser.to_frame().iloc[0, 0])
+
 
 class TestDatetime64DateOffsetArithmetic:
     # -------------------------------------------------------------