String s = new String(new char[] {randomLowSurrogate(random)});
        for (PrimitiveSink sink : sinks) {
          sink.putUnencodedChars(s);
        }
      }
    },
    PUT_STRING_HIGH_SURROGATE() {
      @Override
      void performAction(Random random, Iterable<? extends PrimitiveSink> sinks) {
        String s = new String(new char[] {randomHighSurrogate(random)});