@Override
    public CharSource createSource(String string) throws IOException {
      checkNotNull(string);
      Path file = createFile();
      try (Writer writer = java.nio.file.Files.newBufferedWriter(file, Charsets.UTF_8)) {
        writer.write(string);
      }
      return MoreFiles.asCharSource(file, Charsets.UTF_8);
    }

    @Override
    public String getExpected(String string) {