### Question:
Options implements Serializable { public Options addOption(String opt, String description) { addOption(opt, null, false, description); return this; }  Options addOptionGroup(OptionGroup group); Options addOption(String opt, String description); Options addOption(String opt, boolean hasArg, String description); Options addOption(String opt, String longOpt, boolean hasArg, String description); Options addRequiredOption(String opt, String longOpt, boolean hasArg, String description); Options addOption(Option opt); Collection<Option> getOptions(); List getRequiredOptions(); Option getOption(String opt); List<String> getMatchingOptions(String opt); boolean hasOption(String opt); boolean hasLongOption(String opt); boolean hasShortOption(String opt); OptionGroup getOptionGroup(Option opt); @Override String toString();  }### Answer:
@Test public void testMissingOptionException() throws ParseException { Options options = new Options(); options.addOption(OptionBuilder.isRequired().create("f")); try { new PosixParser().parse(options, new String[0]); fail("Expected MissingOptionException to be thrown"); } catch (MissingOptionException e) { assertEquals("Missing required option: f", e.getMessage()); } }
@Test public void testMissingOptionsException() throws ParseException { Options options = new Options(); options.addOption(OptionBuilder.isRequired().create("f")); options.addOption(OptionBuilder.isRequired().create("x")); try { new PosixParser().parse(options, new String[0]); fail("Expected MissingOptionException to be thrown"); } catch (MissingOptionException e) { assertEquals("Missing required options: f, x", e.getMessage()); } }