}

  public void testMinMaxNatural() {
    assertThat(Comparators.min(1, 2)).isEqualTo(1);
    assertThat(Comparators.min(2, 1)).isEqualTo(1);
    assertThat(Comparators.max(1, 2)).isEqualTo(2);
    assertThat(Comparators.max(2, 1)).isEqualTo(2);
  }

  public void testMinMaxNatural_equalInstances() {
    Foo a = new Foo(1);
    Foo b = new Foo(1);

    comparator = Comparators.emptiesLast(naturalOrder());
  }

  public void testMinMaxNatural() {
    assertThat(Comparators.min(1, 2)).isEqualTo(1);
    assertThat(Comparators.min(2, 1)).isEqualTo(1);
    assertThat(Comparators.max(1, 2)).isEqualTo(2);
    assertThat(Comparators.max(2, 1)).isEqualTo(2);
  }

  public void testMinMaxNatural_equalInstances() {
    Foo a = new Foo(1);
    Foo b = new Foo(1);

      fail("Expected NoSuchElementException");
    } catch (NoSuchElementException expected) {
    }
  }

  public void testOnlyElementSingleton() {
    assertThat(Stream.of(1).collect(MoreCollectors.onlyElement())).isEqualTo(1);
  }

  public void testOnlyElementNull() {
    assertThat(Stream.<@Nullable Object>of((Object) null).collect(MoreCollectors.onlyElement()))
        .isNull();
  }

  public void testOnlyElementMultiple() {

     */
    TopKSelector<Integer> top = TopKSelector.least(7);
    top.offerAll(Ints.asList(5, 7, 6, 2, 4, 3, 1, 0, 0, 0, 0, 0, 0, 0));
    assertThat(top.topK()).isEqualTo(Ints.asList(0, 0, 0, 0, 0, 0, 0));
  }

     */
    TopKSelector<Integer> top = TopKSelector.least(7);
    top.offerAll(Ints.asList(5, 7, 6, 2, 4, 3, 1, 0, 0, 0, 0, 0, 0, 0));
    assertThat(top.topK()).isEqualTo(Ints.asList(0, 0, 0, 0, 0, 0, 0));
  }