}
    builder.add(newString(MIN_LOW_SURROGATE, MAX_HIGH_SURROGATE));
    ILL_FORMED_STRINGS = builder.build();
  }

  // We can't use Character.isSurrogate(c) because of GWT.

  public void testEncodedLength_validStrings() {
    assertEquals(0, Utf8.encodedLength(""));
    assertEquals(11, Utf8.encodedLength("Hello world"));
    assertEquals(8, Utf8.encodedLength("Résumé"));
    assertEquals(
        461,