### Question:
Utils { public static String singleQuote(String identifier) { if (StringUtils.isEmpty(identifier)) { return identifier; } String res = identifier.trim(); if (!res.startsWith("'")) { res = "'" + res; } if (!res.endsWith("'")) { res = res + "'"; } return res; } private  Utils(); static T newTypeInstance(Class<T> clazz); @SuppressWarnings("unchecked") static T newTypeInstance(String className, Class<T> returnClass); static String quote(String identifier); static String singleQuote(String identifier); static String batchQueryGenerator(List<String> statements); static Tuple2<String[], Object[]> prepareTuple4CqlDriver(Tuple2<Cells, Cells> tuple); @SuppressWarnings("unchecked") static Method findSetter(String propertyName, Class entityClass, Class valueType); static boolean setFieldWithReflection(Object object, String fieldName, Object fieldValue); @SuppressWarnings("unchecked") static Method findGetter(String propertyName, Class entityClass); static InetAddress inetAddressFromLocation(String location); static Field[] getAllFields(Class clazz); static List<String> removeAddressPort(List<String> stringList); static String splitListByComma(List<String> hosts); static IExtractor<T, S> getExtractorInstance(S config); static Object castNumberType(Object object, Class clazz); static Object castingUtil(String value, Class classCasting); static W initConfig(S config, W deepJobConfig); static T cloneObjectWithParents(T t); static ExecutorService newBlockingFixedThreadPoolExecutor(int nThreads, int queueSize);  }### Answer:
@Test public void testSingleQuote() throws Exception { }