  @Test
  public void testCloseNone() {

    @SuppressWarnings("unchecked")
    Stream<String> stream = StreamConcatenation.concat((Stream<String>[]) new Stream<?>[0]);
    IntStream intStream = StreamConcatenation.concat(new IntStream[0]);
    LongStream longStream = StreamConcatenation.concat(new LongStream[0]);
    DoubleStream doubleStream = StreamConcatenation.concat(new DoubleStream[0]);
    stream.close();
    intStream.close();
    longStream.close();
    doubleStream.close();
  }