.compare(
                                left.getValue(), right.getValue(), Ordering.natural().nullsFirst())
                            .result();
                      }
                    }.sortedCopy(insertionOrder);
                  }
                })
            .named("TreeMultimap nullsFirst")
            .withFeatures(
                MapFeature.ALLOWS_NULL_KEYS,

                            .compare(
                                left.getValue(), right.getValue(), Ordering.natural().nullsFirst())
                            .result();
                      }
                    }.sortedCopy(insertionOrder);
                  }
                })
            .named("TreeMultimap nullsFirst")
            .withFeatures(
                MapFeature.ALLOWS_NULL_KEYS,

        @Override
        public int compare(Entry<String, Integer> left, Entry<String, Integer> right) {
          return left.getKey().compareTo(right.getKey());
        }
      }.sortedCopy(insertionOrder);
    }

    @Override
    public List<Entry<String, Integer>> create(Object... elements) {
      ImmutableSortedMap.Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();

        @Override
        public int compare(Entry<String, Integer> left, Entry<String, Integer> right) {
          return left.getKey().compareTo(right.getKey());
        }
      }.sortedCopy(insertionOrder);
    }

    @Override
    public List<Entry<String, Integer>> create(Object... elements) {
      ImmutableSortedMap.Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();

  @Override
  public int compare(@CheckForNull Object left, @CheckForNull Object right) {
    return 0;
  }

  @Override
  public <E extends @Nullable Object> List<E> sortedCopy(Iterable<E> iterable) {
    return Lists.newArrayList(iterable);
  }

  @Override
  public <E> ImmutableList<E> immutableSortedCopy(Iterable<E> iterable) {
    return ImmutableList.copyOf(iterable);
  }

  @Override
  public int compare(@CheckForNull Object left, @CheckForNull Object right) {
    return 0;
  }

  @Override
  public <E extends @Nullable Object> List<E> sortedCopy(Iterable<E> iterable) {
    return Lists.newArrayList(iterable);
  }

  @Override
  public <E> ImmutableList<E> immutableSortedCopy(Iterable<E> iterable) {
    return ImmutableList.copyOf(iterable);
  }

    List<@Nullable Integer> sortedInts = numberOrdering.nullsLast().sortedCopy(unsortedInts);
    assertEquals(Arrays.<@Nullable Integer>asList(0, 0, 3, 5, 9, null), sortedInts);

    assertEquals(
        Collections.emptyList(), numberOrdering.sortedCopy(Collections.<Integer>emptyList()));
  }

  public void testImmutableSortedCopy() {

    List<@Nullable Integer> sortedInts = numberOrdering.nullsLast().sortedCopy(unsortedInts);
    assertEquals(Arrays.<@Nullable Integer>asList(0, 0, 3, 5, 9, null), sortedInts);

    assertEquals(
        Collections.emptyList(), numberOrdering.sortedCopy(Collections.<Integer>emptyList()));
  }

  public void testImmutableSortedCopy() {

    @Override
    public Integer[] createArray(int length) {
      return new Integer[length];
    }

    @Override
    public Iterable<Integer> order(List<Integer> insertionOrder) {
      return Ordering.natural().sortedCopy(insertionOrder);
    }

    @Override
    public Set<Integer> create(Object... elements) {
      ImmutableRangeSet.Builder<Integer> builder = ImmutableRangeSet.builder();
      for (Object o : elements) {

                  public Iterable<Entry<Range<Integer>, String>> order(
                      List<Entry<Range<Integer>, String>> insertionOrder) {
                    return Range.<Integer>rangeLexOrdering().onKeys().sortedCopy(insertionOrder);
                  }

                  @SuppressWarnings("unchecked")
                  @Override
                  public Range<Integer>[] createKeyArray(int length) {