code: protected final void assertContains(@NotNull Object... objects) {
      isNotNull();
      checkNotNull(objects);
      Collection<Object> notFound = notFoundInActual(objects);
      if (notFound.isEmpty()) {
        return;
      }
      throw failureIfExpectedElementsNotFound(notFound);
    }
docs: Verifies that the actual actual group of objects contains the given objects, in any order.
  
  @param objects the objects to look for.
  @throws AssertionError       if the actual actual group of objects is {@code null}.
  @throws NullPointerException if the given array is {@code null}.
  @throws AssertionError       if the actual actual group of objects does not contain the given objects.