}

    abstract void doIt(ImmutableDoubleArray.Builder builder, AtomicInteger counter);
  }

  private static final Random RANDOM = new Random(42);

  public void testLength() {
    assertThat(ImmutableDoubleArray.of().length()).isEqualTo(0);
    assertThat(ImmutableDoubleArray.of(0).length()).isEqualTo(1);
    assertThat(ImmutableDoubleArray.of(0, 1, 3).length()).isEqualTo(3);

    }

    abstract void doIt(ImmutableIntArray.Builder builder, AtomicInteger counter);
  }

  private static final Random RANDOM = new Random(42);

  public void testLength() {
    assertThat(ImmutableIntArray.of().length()).isEqualTo(0);
    assertThat(ImmutableIntArray.of(0).length()).isEqualTo(1);
    assertThat(ImmutableIntArray.of(0, 1, 3).length()).isEqualTo(3);

    }

    abstract void doIt(ImmutableDoubleArray.Builder builder, AtomicInteger counter);
  }

  private static final Random RANDOM = new Random(42);

  public void testLength() {
    assertThat(ImmutableDoubleArray.of().length()).isEqualTo(0);
    assertThat(ImmutableDoubleArray.of(0).length()).isEqualTo(1);
    assertThat(ImmutableDoubleArray.of(0, 1, 3).length()).isEqualTo(3);