public abstract class AbstractListIndexOfTester<E> extends AbstractListTester<E> {
  /** Override to call {@code indexOf()} or {@code lastIndexOf()}. */
  protected abstract int find(@Nullable Object o);

  /** Override to return "indexOf" or "lastIndexOf()" for use in failure messages. */
  protected abstract String getMethodName();

  @CollectionSize.Require(absent = ZERO)

    StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
    int templateStart = 0;
    int i = 0;
    while (i < args.length) {
      int placeholderStart = template.indexOf("%s", templateStart);
      if (placeholderStart == -1) {
        break;
      }
      builder.append(template.substring(templateStart, placeholderStart));
      builder.append(args[i++]);

    UnicodeEscaper e = new PercentEscaper("+*/-", false);
    for (char c = 0; c < 128; c++) {
      if ((c >= '0' && c <= '9')
          || (c >= 'a' && c <= 'z')
          || (c >= 'A' && c <= 'Z')
          || "+*/-".indexOf(c) >= 0) {
        assertUnescaped(e, c);
      } else {
        assertEscaping(e, escapeAscii(c), c);
      }
    }
  }

  /** Tests that if specify '%' as safe the result is an idempotent escaper. */

    }

    @Override
    public boolean addAll(Collection<? extends T> collection) {
      return standardAddAll(collection);
    }

    @Override
    public boolean addAll(int index, Collection<? extends T> elements) {
      return standardAddAll(index, elements);
    }

    @Override
    public void clear() {
      standardClear();
    }

    @Override
    public boolean contains(Object object) {

    return this;
  }

  @Override
  public boolean contains(@CheckForNull Object object) {
    return false;
  }

  @GwtIncompatible // not used by GWT emulation
  @Override
  int indexOf(@CheckForNull Object target) {
    return -1;
  }

  @Override
  public UnmodifiableIterator<C> iterator() {
    return Iterators.emptyIterator();
  }

  @GwtIncompatible // NavigableSet
  @Override

    UnicodeEscaper e = new PercentEscaper("+*/-", false);
    for (char c = 0; c < 128; c++) {
      if ((c >= '0' && c <= '9')
          || (c >= 'a' && c <= 'z')
          || (c >= 'A' && c <= 'Z')
          || "+*/-".indexOf(c) >= 0) {
        assertUnescaped(e, c);
      } else {
        assertEscaping(e, escapeAscii(c), c);
      }
    }
  }

  /** Tests that if specify '%' as safe the result is an idempotent escaper. */

    expectContents(expected);
  }

  protected final void expectAdded(int index, E... elements) {
    expectAdded(index, Arrays.asList(elements));
  }

  protected final void expectAdded(int index, Collection<E> elements) {
    List<E> expected = Helpers.copyToList(getSampleElements());
    expected.addAll(index, elements);
    expectContents(expected);
  }

  /*

    StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
    int templateStart = 0;
    int i = 0;
    while (i < args.length) {
      int placeholderStart = template.indexOf("%s", templateStart);
      if (placeholderStart == -1) {
        break;
      }
      builder.append(template.substring(templateStart, placeholderStart));
      builder.append(args[i++]);

        List<String> order = new ArrayList<>();
        for (String s : insertionOrder) {
          int index = order.indexOf(s);
          if (index == -1) {
            order.add(s);
          } else {
            order.add(index, s);
          }
        }
        return order;
      }
    };
  }

        List<String> order = new ArrayList<>();
        for (String s : insertionOrder) {
          int index = order.indexOf(s);
          if (index == -1) {
            order.add(s);
          } else {
            order.add(index, s);
          }
        }
        return order;
      }
    };
  }