code: public final Reporter line(final String line, final Object... args) {
          counter++;
          wasEmptyLine = false;
          message.append(TAB).append(String.format(line, args)).append(NEWLINE);
          return this;
      }
docs: Prints formatted line.
  
  @param line line with {@code String.format} syntax
  @param args message arguments
  @return reporter instance