code: @Test public void should_fail_if_actual_has_some_not_mutually_comparable_elements_according_to_given_comparator(){
    AssertionInfo info=someInfo();
    List<Object> actual=newArrayList();
    actual.add("bar");
    actual.add(new Integer(5));
    actual.add("foo");
    try {
      lists.assertIsSortedAccordingToComparator(info,actual,stringDescendingOrderComparator);
    }
   catch (  AssertionError e) {
      verify(failures).failure(info,shouldHaveComparableElementsAccordingToGivenComparator(actual,stringDescendingOrderComparator));
      return;
    }
    failBecauseExpectedAssertionErrorWasNotThrown();
  }
  