.that(step2.statusFuture().isCancelled())
        .isTrue();
    // Its closeable is closed.
    assertClosed(closeable2);

    // Step 3 was cancelled before it began
    assertWithMessage("step3.statusFuture().isCancelled()")
        .that(step3.statusFuture().isCancelled())
        .isTrue();
    // Its closeable is still open.
    assertStillOpen(closeable3);

        .that(step2.statusFuture().isCancelled())
        .isTrue();
    // Its closeable is closed.
    assertClosed(closeable2);

    // Step 3 was cancelled before it began
    assertWithMessage("step3.statusFuture().isCancelled()")
        .that(step3.statusFuture().isCancelled())
        .isTrue();
    // Its closeable is still open.
    assertStillOpen(closeable3);

        .containsNoneOf(Object.class, new TypeToken<Iterable<Number>>() {}.getType());
    assertThat(new TypeToken<List<? extends Number>>() {}.isSupertypeOf(fieldType)).isTrue();
    assertThat(new TypeToken<List<? extends Iterable<?>>>() {}.isSupertypeOf(fieldType)).isTrue();
    assertThat(new TypeToken<List<? extends Iterable<Number>>>() {}.isSupertypeOf(fieldType))
        .isFalse();
  }

  public void testArrayClassPreserved() {

    Iterator<Integer> i = singletonIterator(1);
    assertThat(i.hasNext()).isTrue();
    assertThat(i.next()).isEqualTo(1);
    assertThat(i.hasNext()).isFalse();
  }

  public void testSingletonNullIteratorBasic() {
    Iterator<@Nullable Integer> i = singletonIterator(null);
    assertThat(i.hasNext()).isTrue();
    assertThat(i.next()).isEqualTo(null);
    assertThat(i.hasNext()).isFalse();
  }

        .containsNoneOf(Object.class, new TypeToken<Iterable<Number>>() {}.getType());
    assertThat(new TypeToken<List<? extends Number>>() {}.isSupertypeOf(fieldType)).isTrue();
    assertThat(new TypeToken<List<? extends Iterable<?>>>() {}.isSupertypeOf(fieldType)).isTrue();
    assertThat(new TypeToken<List<? extends Iterable<Number>>>() {}.isSupertypeOf(fieldType))
        .isFalse();
  }

  public void testArrayClassPreserved() {

  // For a (long) discussion about this specific issue and the general futility of life.
  //
  // For the time being we are OK with the problem discussed above since it requires a caller to
  // introduce a very specific kind of data-race. And given the other operations performed by these
  // methods that involve volatile read/write operations, in practice there is no issue. Also, the