### Question:
MnemonicUtil { public static List<String> randomMnemonicCodes() { return toMnemonicCodes(NumericUtil.generateRandomBytes(16)); }  static void validateMnemonics(List<String> mnemonicCodes); static List<String> randomMnemonicCodes();  }### Answer:
@Test public void testRandomMnemonicCodes() { List<String> mnemonic = MnemonicUtil.randomMnemonicCodes(); assertEquals("Should be 12 words", 12, mnemonic.size()); MnemonicUtil.validateMnemonics(mnemonic); assertTrue("Should valid", true); }