### Question:
Utils { public static byte[] generateNonce() { byte[] values = new byte[NONONCE_LENGTH]; RANDOM.nextBytes(values); return values; } private  Utils(); static String generateParameterHash(String path, String func, List<String> args); static String generateDirectoryHash(String rootDir, String chaincodeDir, String hash); static byte[] generateTarGz(File sourceDirectory, String pathPrefix); static byte[] readFile(File input); static String generateUUID(); static Timestamp generateTimestamp(); static void deleteFileOrDirectory(File file); static byte[] hash(byte[] input, Digest digest); static String combinePaths(String first, String... other); static byte[] readFileFromClasspath(String fileName); static Properties parseGrpcUrl(String url); static Exception checkGrpcUrl(String url); static boolean isNullOrEmpty(String url); static String logString(final String string); static byte[] generateNonce(); static String toHexString(ByteString byteString); static String toHexString(byte[] bytes);  }### Answer:
@Test public void testGenerateNonce() { byte[] nonce1 = Utils.generateNonce(); byte[] nonce2 = Utils.generateNonce(); Assert.assertNotNull(nonce1); Assert.assertNotNull(nonce2); Assert.assertNotEquals("generateNonce returned a duplicate nonce!", nonce1, nonce2); }