@BeforeExperiment
  void setUp() {
    this.matcher = precomputed ? config.matcher.precomputed() : config.matcher;
    if (size == Size.SMALL) {
      BitSet tmp = new BitSet();
      matcher.setBits(tmp);
      int matchedCharCount = tmp.cardinality();
      this.matcher = SmallCharMatcher.from(tmp, "");
    }
    this.string = checkString(length, percent, config.matchingChars, new Random(), forceSlow, web);
  }