this.header = new AvlNode<>();
    successor(header, header);
    this.rootReference = new Reference<>();
  }

  /** A function which can be summed across a subtree. */
  private enum Aggregate {
    SIZE {
      @Override
      int nodeAggregate(AvlNode<?> node) {
        return node.elemCount;
      }

      @Override
      long treeAggregate(@Nullable AvlNode<?> root) {

    assertThat(
      requestAfter.exchangeIndex == 0 ||
        server.requestCount == 3 &&
        server.takeRequest().exchangeIndex == 0,
    ).isTrue()
  }

  internal enum class WriteKind {
    BYTE_BY_BYTE,
    SMALL_BUFFERS,
    LARGE_BUFFERS,
  }

  @Test
  fun chunkedUpload_byteByByte() {
    doUpload(TransferKind.CHUNKED, WriteKind.BYTE_BY_BYTE)
  }

   * long[])}.
   *
   * @since 2.0
   */
  public static Comparator<long[]> lexicographicalComparator() {
    return LexicographicalComparator.INSTANCE;
  }

  private enum LexicographicalComparator implements Comparator<long[]> {
    INSTANCE;

    @Override
    public int compare(long[] left, long[] right) {
      int minLength = Math.min(left.length, right.length);

   * Returns a predicate that returns the result of {@link File#isFile} on input files.
   *
   * @since 15.0
   */
  public static Predicate<File> isFile() {
    return FilePredicate.IS_FILE;
  }

  private enum FilePredicate implements Predicate<File> {
    IS_DIRECTORY {
      @Override
      public boolean apply(File file) {
        return file.isDirectory();
      }

      @Override

    }
  }

  private fun Editor.setString(
    index: Int,
    value: String,
  ) {
    newSink(index).buffer().use { writer ->
      writer.writeUtf8(value)
    }
  }

  enum class Subject {
    System {
      override fun create() = FileSystem.SYSTEM

      override val windows: Boolean
        get() = TestUtil.windows
    },

    FakeUnix {

  }

  boolean usesKeyReferences() {
    return keyStrength != Strength.STRONG;
  }

  boolean usesValueReferences() {
    return valueStrength != Strength.STRONG;
  }

  enum Strength {
    /*
     * TODO(kevinb): If we strongly reference the value and aren't loading, we needn't wrap the
     * value. This could save ~8 bytes per entry.
     */

    STRONG {
      @Override

   */
  @VisibleForTesting
  CountDownLatch whenClosedCountDown() {
    return closeables.whenClosedCountDown();
  }

  /** The state of a {@link CloseableList}. */
  enum State {
    /** The {@link CloseableList} has not been subsumed or closed. */
    OPEN,

    /**
     * The {@link CloseableList} has been subsumed into another. It may not be closed or subsumed

    map.put(3, 20);
    map.put(1, 30);
    TreeMap<Integer, Integer> copy = Maps.newTreeMap(map);
    assertEquals(copy, map);
    assertSame(copy.comparator(), map.comparator());
  }

  public enum SomeEnum {
    SOME_INSTANCE
  }

  public void testEnumMap() {
    EnumMap<SomeEnum, Integer> map = Maps.newEnumMap(SomeEnum.class);
    assertEquals(emptyMap(), map);
    map.put(SomeEnum.SOME_INSTANCE, 0);

    val truncatedBody = Buffer()
    truncatedBody.write(fullBody, numBytesToKeep.toLong())
    builder.body(truncatedBody)
    builder.headers(headers)
    return builder
  }

  internal enum class TransferKind {
    CHUNKED {
      override fun setBody(
        response: MockResponse.Builder,
        content: Buffer,
        chunkSize: Int,
      ) {

    }
    if (builder.getValueStrength() == Strength.WEAK) {
      throw new IllegalArgumentException("Map cannot have both weak and dummy values");
    }
    throw new AssertionError();
  }

  enum Strength {
    STRONG {
      @Override
      Equivalence<Object> defaultEquivalence() {
        return Equivalence.equals();
      }
    },

    WEAK {
      @Override