@GwtIncompatible // used only in GwtIncompatible tests
  private static void runExtensiveMergerTest(Merger merger) throws InterruptedException {
    int inputCount = new TestFutureBatch().allFutures.size();

    for (int i = 0; i < inputCount; i++) {
      for (int j = 0; j < inputCount; j++) {
        for (boolean iBeforeJ : new boolean[] {true, false}) {
          TestFutureBatch inputs = new TestFutureBatch();

  @GwtIncompatible // used only in GwtIncompatible tests
  private static void runExtensiveMergerTest(Merger merger) throws InterruptedException {
    int inputCount = new TestFutureBatch().allFutures.size();

    for (int i = 0; i < inputCount; i++) {
      for (int j = 0; j < inputCount; j++) {
        for (boolean iBeforeJ : new boolean[] {true, false}) {
          TestFutureBatch inputs = new TestFutureBatch();

   * indexable using ints.
   */
  static final int MAXIMUM_CAPACITY = 1 << 30;

  /** The maximum number of segments to allow; used to bound constructor arguments. */
  static final int MAX_SEGMENTS = 1 << 16; // slightly conservative

  /** Number of (unsynchronized) retries in the containsValue method. */
  static final int CONTAINS_VALUE_RETRIES = 3;

  /**

      HashMap<K, V> newHashMapWithExpectedSize(int expectedSize) {
    return new HashMap<>(capacity(expectedSize));
  }

  /**
   * Returns a capacity that is sufficient to keep the map from being resized as long as it grows no
   * larger than expectedSize and the load factor is ≥ its default (0.75).
   */
  static int capacity(int expectedSize) {
    if (expectedSize < 3) {

      HashMap<K, V> newHashMapWithExpectedSize(int expectedSize) {
    return new HashMap<>(capacity(expectedSize));
  }

  /**
   * Returns a capacity that is sufficient to keep the map from being resized as long as it grows no
   * larger than expectedSize and the load factor is ≥ its default (0.75).
   */
  static int capacity(int expectedSize) {
    if (expectedSize < 3) {

   * indexable using ints.
   */
  static final int MAXIMUM_CAPACITY = 1 << 30;

  /** The maximum number of segments to allow; used to bound constructor arguments. */
  static final int MAX_SEGMENTS = 1 << 16; // slightly conservative

  /** Number of (unsynchronized) retries in the containsValue method. */
  static final int CONTAINS_VALUE_RETRIES = 3;

  /**