### Question:
WindowsLoginCredentialsFromEncryptedData implements Function<PasswordDataAndPrivateKey, LoginCredentials> { @Override public LoginCredentials apply(@Nullable PasswordDataAndPrivateKey dataAndKey) { if (dataAndKey == null) return null; try { KeySpec keySpec = Pems.privateKeySpec(dataAndKey.getPrivateKey()); KeyFactory kf = crypto.rsaKeyFactory(); PrivateKey privKey = kf.generatePrivate(keySpec); Cipher cipher = crypto.cipher("RSA"); cipher.init(Cipher.DECRYPT_MODE, privKey); byte[] cipherText = base64().decode(dataAndKey.getPasswordData().getPasswordData()); byte[] plainText = cipher.doFinal(cipherText); String password = new String(plainText, Charsets.US_ASCII); return LoginCredentials.builder() .user("Administrator") .password(password) .noPrivateKey() .build(); } catch (Exception e) { throw Throwables.propagate(e); } } @Inject  WindowsLoginCredentialsFromEncryptedData(Crypto crypto); @Override LoginCredentials apply(@Nullable PasswordDataAndPrivateKey dataAndKey);  }### Answer:
@Test public void testApply() throws Exception { WindowsLoginCredentialsFromEncryptedData f = new WindowsLoginCredentialsFromEncryptedData(new JCECrypto()); PasswordData passwordData = PasswordData.builder() .instanceId("i-2574e22a") .timestamp(dateService.iso8601DateParse("2012-07-30T07:27:23.000+0000")) .passwordData(ENCRYPTED_PASSWORD).build(); LoginCredentials credentials = f.apply(new PasswordDataAndPrivateKey(passwordData, PRIVATE_KEY)); assertEquals(credentials.getUser(), "Administrator"); assertEquals(credentials.getOptionalPassword().get(), "u4.y9mb;nR."); assertFalse(credentials.getOptionalPrivateKey().isPresent()); }