.addEqualityGroup(ordering, Ordering.natural().nullsLast())
        .addEqualityGroup(numberOrdering.nullsLast())
        .addEqualityGroup(Ordering.natural())
        .testEquals();
  }

  public void testBinarySearch() {
    List<Integer> ints = Lists.newArrayList(0, 2, 3, 5, 7, 9);
    assertEquals(4, numberOrdering.binarySearch(ints, 7));
  }

  public void testSortedCopy() {
    List<@Nullable Integer> unsortedInts =

        .addEqualityGroup(ordering, Ordering.natural().nullsLast())
        .addEqualityGroup(numberOrdering.nullsLast())
        .addEqualityGroup(Ordering.natural())
        .testEquals();
  }

  public void testBinarySearch() {
    List<Integer> ints = Lists.newArrayList(0, 2, 3, 5, 7, 9);
    assertEquals(4, numberOrdering.binarySearch(ints, 7));
  }

  public void testSortedCopy() {
    List<@Nullable Integer> unsortedInts =