### Question:
AWSIotClientIdHelper { static String generateClientId() { return UUID.randomUUID().toString(); } private  AWSIotClientIdHelper();   }### Answer:
@Test public void testGenerateClientId() throws Exception { String testId1 = AWSIotClientIdHelper.generateClientId(); String testId2 = AWSIotClientIdHelper.generateClientId(); String testId3 = AWSIotClientIdHelper.generateClientId(); assertEquals(36, testId1.length()); assertEquals(36, testId2.length()); assertEquals(36, testId3.length()); assertFalse(testId1.equals(testId2)); assertFalse(testId2.equals(testId3)); assertFalse(testId1.equals(testId3)); }