TestAccountValidator.java

class TestAccountValidator extends AccountValidator {
  @Override public void validate(String username, String password, Callback callback) {
    if ("valid_username".equals(username) && "valid_password".equals(password)) {
      callback.onValidationComplete(true);
    } else {
      callback.onValidationComplete(false);
    }
  }

  @Override public boolean isValidating() {
    return false;
  }
}