utf8Lengths.put(0x7f, 1);
    utf8Lengths.put(0x80, 2);
    utf8Lengths.put(0x7ff, 2);
    utf8Lengths.put(0x800, 3);
    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT - 1, 3);
    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT, 4);
    utf8Lengths.put(MAX_CODE_POINT, 4);

    Integer[] codePoints = utf8Lengths.keySet().toArray(new Integer[] {});
    StringBuilder sb = new StringBuilder();
    Random rnd = new Random();

    UnicodeEscaper e = SIMPLE_ESCAPER;
    String expected =
        "[0]abyz[128][256][2048][4096]ABYZ[65535]"
            + "["
            + Character.MIN_SUPPLEMENTARY_CODE_POINT
            + "]"
            + "0189["
            + Character.MAX_CODE_POINT
            + "]";
    assertEquals(expected, escapeAsString(e, TEST_STRING));
  }

  public void testGrowBuffer() { // need to grow past an initial 1024 byte buffer

          // Mostly 3-byte UTF-8 sequences - "Asian" text
          return Character.MIN_SUPPLEMENTARY_CODE_POINT;
        } else if (userFriendly.matches("(?i)(?:Cuneiform|rare|exotic|supplementary.*)")) {
          // Mostly 4-byte UTF-8 sequences - "rare exotic" text
          return Character.MAX_CODE_POINT;
        } else {
          throw new IllegalArgumentException("Can't decode codepoint " + userFriendly);
        }

  @GwtIncompatible // Floats.tryParse
  public void testTryParseAllCodePoints() {
    // Exercise non-ASCII digit test cases and the like.
    char[] tmp = new char[2];
    for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
      Character.toChars(i, tmp, 0);
      checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
    }
  }

  @GwtIncompatible // Floats.tryParse

    utf8Lengths.put(0x7f, 1);
    utf8Lengths.put(0x80, 2);
    utf8Lengths.put(0x7ff, 2);
    utf8Lengths.put(0x800, 3);
    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT - 1, 3);
    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT, 4);
    utf8Lengths.put(MAX_CODE_POINT, 4);

    Integer[] codePoints = utf8Lengths.keySet().toArray(new Integer[] {});
    StringBuilder sb = new StringBuilder();
    Random rnd = new Random();

    // escaping elements from a map you would use a ArrayBasedCharEscaper).
    UnicodeEscaper escaper =
        new ArrayBasedUnicodeEscaper(
            SIMPLE_REPLACEMENTS, Character.MIN_VALUE, Character.MAX_CODE_POINT, null) {
          @Override
          protected char[] escapeUnsafe(int c) {
            return NO_CHARS;
          }
        };
    EscaperAsserts.assertBasic(escaper);

    UnicodeEscaper e = SIMPLE_ESCAPER;
    String expected =
        "[0]abyz[128][256][2048][4096]ABYZ[65535]"
            + "["
            + Character.MIN_SUPPLEMENTARY_CODE_POINT
            + "]"
            + "0189["
            + Character.MAX_CODE_POINT
            + "]";
    assertEquals(expected, escapeAsString(e, TEST_STRING));
  }

  public void testGrowBuffer() { // need to grow past an initial 1024 byte buffer

  @GwtIncompatible // Doubles.tryParse
  public void testTryParseAllCodePoints() {
    // Exercise non-ASCII digit test cases and the like.
    char[] tmp = new char[2];
    for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
      Character.toChars(i, tmp, 0);
      checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
    }
  }

  @GwtIncompatible // Doubles.tryParse

  @GwtIncompatible // Doubles.tryParse
  public void testTryParseAllCodePoints() {
    // Exercise non-ASCII digit test cases and the like.
    char[] tmp = new char[2];
    for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
      Character.toChars(i, tmp, 0);
      checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
    }
  }

  @GwtIncompatible // Doubles.tryParse

   * Returns an iterable whose iterators cycle indefinitely over the elements of {@code iterable}.
   *
   * <p>That iterator supports {@code remove()} if {@code iterable.iterator()} does. After {@code
   * remove()} is called, subsequent cycles omit the removed element, which is no longer in {@code
   * iterable}. The iterator's {@code hasNext()} method returns {@code true} until {@code iterable}
   * is empty.
   *