### Question:
AccountBaseService { public Result changePassword(String address, String oldPassword, String newPassword) { if (!AddressTool.validAddress(address)) { return Result.getFailed(AccountErrorCode.ADDRESS_ERROR); } if (StringUtils.isBlank(oldPassword)) { return Result.getFailed(AccountErrorCode.PARAMETER_ERROR); } if (StringUtils.isBlank(newPassword)) { return Result.getFailed(AccountErrorCode.PARAMETER_ERROR); } if (!StringUtils.validPassword(oldPassword)) { return Result.getFailed(AccountErrorCode.PASSWORD_FORMAT_WRONG); } if (!StringUtils.validPassword(newPassword)) { return Result.getFailed(AccountErrorCode.PASSWORD_FORMAT_WRONG); } Account account = accountService.getAccount(address).getData(); if (null == account) { return Result.getFailed(AccountErrorCode.ACCOUNT_NOT_EXIST); } try { if (!account.isEncrypted()) { return Result.getFailed(AccountErrorCode.ACCOUNT_UNENCRYPTED); } if (!account.validatePassword(oldPassword)) { return Result.getFailed(AccountErrorCode.PASSWORD_IS_WRONG); } account.unlock(oldPassword); account.encrypt(newPassword, true); AccountPo po = new AccountPo(account); Result result = accountStorageService.updateAccount(po); if (result.isFailed()) { return Result.getFailed(AccountErrorCode.FAILED); } accountCacheService.localAccountMaps.put(account.getAddress().getBase58(), account); return result.setData(true); } catch (NulsException e) { Log.error(e); return Result.getFailed(e.getErrorCode()); } }  Result setRemark(String address, String remark); Result getPrivateKey(String address, String password); Result getAllPrivateKey(String password); Result getAllPrivateKey(); Result setPassword(String address, String password); Result changePassword(String address, String oldPassword, String newPassword);  }### Answer:
@Test public void changePassword() { List<Account> accounts = this.accountService.createAccount(1, "nuls123456").getData(); Account account = accounts.get(0); accountBaseService.changePassword(account.getAddress().toString(),"nuls123456", "nuls111111"); Account acc = accountService.getAccount(account.getAddress()).getData(); try { assertFalse(acc.unlock("nuls123456")); assertTrue(acc.unlock("nuls111111")); assertArrayEquals(acc.getPriKey(), account.getPriKey()); } catch (NulsException e) { } }