code: public static String randomString(Long numberOfLetters, String notationMethod, boolean useNumbers, TestContext context) {
          return new RandomStringFunction().execute(Arrays.asList(String.valueOf(numberOfLetters), notationMethod, String.valueOf(useNumbers)), context);
      }
docs: Runs random string function with arguments.
  @param numberOfLetters
  @param notationMethod
  @param useNumbers
  @return