### Question:
WalletUtils { public static Bip39Wallet generatePlatONBip39Wallet(String password, File destinationDirectory) throws CipherException, IOException { byte[] initialEntropy = new byte[16]; secureRandom.nextBytes(initialEntropy); String mnemonic = MnemonicUtils.generateMnemonic(initialEntropy); byte[] seed = MnemonicUtils.generateSeed(mnemonic, password); ECKeyPair ecKeyPair = ECKeyPair.create(sha256(seed)); String fileName = generatePlatONWalletFile(password, ecKeyPair, destinationDirectory); return new Bip39Wallet(fileName, mnemonic); }  static String generateFullNewWalletFile(String password, File destinationDirectory); static String generateLightNewWalletFile(String password, File destinationDirectory); static String generatePlatONWalletFile(String password, File destinationDirectory); static Bip39Wallet generatePlatONBip39Wallet(String password, File destinationDirectory); static String generatePlatONWalletFile(String password, ECKeyPair ecKeyPair, File destinationDirectory); static String generateNewWalletFile(String password, File destinationDirectory); static String generateNewWalletFile(
            String password, File destinationDirectory, boolean useFullScrypt); static String generateWalletFile(
            String password, ECKeyPair ecKeyPair, File destinationDirectory, boolean useFullScrypt); static Bip39Wallet generateBip39Wallet(String password, File destinationDirectory); static Credentials loadCredentials(String password, String source); static Credentials loadCredentials(String password, File source); static Credentials loadBip39Credentials(String password, String mnemonic); static String getDefaultKeyDirectory(); static String getTestnetKeyDirectory(); static String getMainnetKeyDirectory(); static String getRinkebyKeyDirectory(); static boolean isValidPrivateKey(String privateKey); static boolean isValidAddress(String input);  }### Answer:
@Test public void testGeneratePlatONBip39Wallet() throws Exception { Bip39Wallet wallet = WalletUtils.generatePlatONBip39Wallet(PASSWORD, tempDir); byte[] seed = MnemonicUtils.generateSeed(wallet.getMnemonic(), PASSWORD); Credentials credentials = Credentials.create(ECKeyPair.create(sha256(seed))); assertEquals(credentials, WalletUtils.loadBip39Credentials(PASSWORD, wallet.getMnemonic())); }