} catch (UnsupportedOperationException expected) {
    }
  }

  public void testTransform_absent() {
    assertEquals(Optional.absent(), Optional.absent().transform(Functions.identity()));
    assertEquals(Optional.absent(), Optional.absent().transform(Functions.toStringFunction()));
  }

  public void testTransform_presentIdentity() {
    assertEquals(Optional.of("a"), Optional.of("a").transform(Functions.identity()));

                  }
                },
                directExecutor());
    assertThat(f.get()).isEqualTo(CustomRuntimeException.class);
  }

  public void testTransform() throws Exception {
    FluentFuture<Integer> f =
        FluentFuture.from(immediateFuture(1))
            .transform(
                new Function<Integer, Integer>() {
                  @Override

    Iterator<String> iterator = list.iterator();
    assertThat(Iterators.tryFind(iterator, Predicates.alwaysFalse())).isAbsent();
    assertFalse(iterator.hasNext());
  }

  public void testTransform() {
    Iterator<String> input = asList("1", "2", "3").iterator();
    Iterator<Integer> result =
        Iterators.transform(
            input,
            new Function<String, Integer>() {

    } catch (UnsupportedOperationException expected) {
    }
  }

  public void testTransform_absent() {
    assertEquals(Optional.absent(), Optional.absent().transform(Functions.identity()));
    assertEquals(Optional.absent(), Optional.absent().transform(Functions.toStringFunction()));
  }

  public void testTransform_presentIdentity() {
    assertEquals(Optional.of("a"), Optional.of("a").transform(Functions.identity()));

  public void testTransform_genericsNull() throws Exception {
    ListenableFuture<?> nullFuture = immediateFuture(null);
    ListenableFuture<?> transformedFuture = transform(nullFuture, constant(null), directExecutor());
    assertNull(getDone(transformedFuture));
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testTransform_genericsHierarchy() throws Exception {

                  }
                },
                directExecutor());
    assertThat(f.get()).isEqualTo(CustomRuntimeException.class);
  }

  public void testTransform() throws Exception {
    FluentFuture<Integer> f =
        FluentFuture.from(immediateFuture(1))
            .transform(
                new Function<Integer, Integer>() {
                  @Override

  public void testTransform_genericsNull() throws Exception {
    ListenableFuture<?> nullFuture = immediateFuture(null);
    ListenableFuture<?> transformedFuture = transform(nullFuture, constant(null), directExecutor());
    assertNull(getDone(transformedFuture));
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testTransform_genericsHierarchy() throws Exception {

    // Step 4's closeable is now closed.
    assertClosed(closeable4);
    // Step 3 still never ran, so its closeable should still be open.
    assertStillOpen(closeable3);
  }

  public void testTransform() throws Exception {
    ClosingFuture<String> closingFuture =
        ClosingFuture.from(immediateFuture("value"))
            .transform(
                new ClosingFunction<String, TestCloseable>() {

    blist.forEach(b -> assertThat(b).isEqualTo(expectedIterator.next()));
    assertThat(expectedIterator.hasNext()).isFalse();
  }

  public void testTransform_iterator() {
    List<String> input = asList("1", "2", "3");
    Iterable<Integer> result =
        Iterables.transform(
            input,
            new Function<String, Integer>() {
              @Override

    // Step 4's closeable is now closed.
    assertClosed(closeable4);
    // Step 3 still never ran, so its closeable should still be open.
    assertStillOpen(closeable3);
  }

  public void testTransform() throws Exception {
    ClosingFuture<String> closingFuture =
        ClosingFuture.from(immediateFuture("value"))
            .transform(
                new ClosingFunction<String, TestCloseable>() {