@Test
 public void shouldConvertToJavaStream() {
   final Value<Integer> value = of(1, 2, 3);
   final java.util.stream.Stream<Integer> s1 = value.toJavaStream();
   if (value.isSingleValued()) {
     final java.util.stream.Stream<Integer> s2 = java.util.stream.Stream.of(1);
     assertThat(List.ofAll(s1::iterator)).isEqualTo(List.ofAll(s2::iterator));
   } else {
     final java.util.stream.Stream<Integer> s2 = java.util.stream.Stream.of(1, 2, 3);
     assertThat(List.ofAll(s1::iterator)).isEqualTo(List.ofAll(s2::iterator));
   }
 }