@Test
    void testStream() {
        final List<Integer> expected = IntStream.range(0, degree).boxed().collect(toList());
        final List<Object> actual = instance.stream().map(Optional::get).collect(toList());
        assertEquals(expected, actual);
    }
@author Per Minborg
@param <T> tuple of nullable type
common-parent/tuple/src/test/java/com/speedment/common/tuple/internal/nullable/AbstractTupleImplTest.java