code: public static <T> Matcher<T> isNotIn(Collection<T> collection) {
          return not(isIn(collection));
      }
docs: Equivalent of {@code not(isIn(Collection<T>)} matcher combination
  @see org.hamcrest.Matchers#isIn(java.util.Collection)
  @param collection the collection to match against
  @param <T> the matcher type
  @return the matcher