ImmutableList<String> list =
        new ImmutableList.Builder<String>().add("a").add("b").add("a").add("c").build();
    assertEquals(asList("a", "b", "a", "c"), list);
  }

  @GwtIncompatible("Builder impl")
  public void testBuilderForceCopy() {
    ImmutableList.Builder<Integer> builder = ImmutableList.builder();
    Object[] prevArray = null;
    for (int i = 0; i < 10; i++) {
      builder.add(i);

    ImmutableList<String> list =
        new ImmutableList.Builder<String>().add("a").add("b").add("a").add("c").build();
    assertEquals(asList("a", "b", "a", "c"), list);
  }

  @GwtIncompatible("Builder impl")
  public void testBuilderForceCopy() {
    ImmutableList.Builder<Integer> builder = ImmutableList.builder();
    Object[] prevArray = null;
    for (int i = 0; i < 10; i++) {
      builder.add(i);