BUG-23282 Add additional tests

Author: JustinZhengBC

pandas/core/nanops.py

@@ -721,6 +721,9 @@ def reduction(values, axis=None, skipna=True, mask=None):
                 result = np.nan
         else:
             result = getattr(values, meth)(axis)
+            if (is_integer(result) and is_datetime_or_timedelta_dtype(dtype)
+                    and result == _int64_max):
+                result = tslibs.iNaT
 
         result = _wrap_results(result, dtype)
         return _maybe_null_out(result, axis, mask)