### Question:
GenerateOzoneRequiredConfigurations extends GenericCli { public static void generateConfigurations(String path) throws PicocliException, JAXBException, IOException { if (!isValidPath(path)) { throw new PicocliException("Invalid directory path."); } if (!canWrite(path)) { throw new PicocliException("Insufficient permission."); } OzoneConfiguration oc = new OzoneConfiguration(); ClassLoader cL = Thread.currentThread().getContextClassLoader(); if (cL == null) { cL = OzoneConfiguration.class.getClassLoader(); } URL url = cL.getResource("ozone-default.xml"); List<OzoneConfiguration.Property> allProperties = oc.readPropertyFromXml(url); List<OzoneConfiguration.Property> requiredProperties = new ArrayList<>(); for (OzoneConfiguration.Property p : allProperties) { if (p.getTag() != null && p.getTag().contains("REQUIRED")) { if (p.getName().equalsIgnoreCase( OzoneConfigKeys.OZONE_METADATA_DIRS)) { p.setValue(System.getProperty(OzoneConsts.JAVA_TMP_DIR)); } else if (p.getName().equalsIgnoreCase( OMConfigKeys.OZONE_OM_ADDRESS_KEY) || p.getName().equalsIgnoreCase(ScmConfigKeys.OZONE_SCM_NAMES) || p.getName().equalsIgnoreCase( ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY)) { p.setValue(OzoneConsts.LOCALHOST); } requiredProperties.add(p); } } OzoneConfiguration.XMLConfiguration requiredConfig = new OzoneConfiguration.XMLConfiguration(); requiredConfig.setProperties(requiredProperties); File output = new File(path, "ozone-site.xml"); if(output.createNewFile()){ JAXBContext context = JAXBContext.newInstance(OzoneConfiguration.XMLConfiguration.class); Marshaller m = context.createMarshaller(); m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE); m.marshal(requiredConfig, output); System.out.println("ozone-site.xml has been generated at " + path); } else { System.out.printf("ozone-site.xml already exists at %s and " + "will not be overwritten%n", path); } }  static void main(String[] args); @Override Void call(); static void generateConfigurations(String path); static boolean isValidPath(String path); static boolean canWrite(String path);  }### Answer:
@Test public void testGenerateConfigurations() throws Exception { File tempPath = getRandomTempDir(); String[] args = new String[]{tempPath.getAbsolutePath()}; execute(args, "ozone-site.xml has been generated at " + tempPath.getAbsolutePath()); URL url = new File(tempPath.getAbsolutePath() + "/ozone-site.xml") .toURI().toURL(); OzoneConfiguration oc = new OzoneConfiguration(); List<OzoneConfiguration.Property> allProperties = oc.readPropertyFromXml(url); for (OzoneConfiguration.Property p : allProperties) { Assert.assertTrue( p.getValue() != null && p.getValue().length() > 0); } }