protected function drupalLogin(stdClass $user) {

    if (!module_exists('zagat_users')) {
      return parent::drupalLogin($user);
    }

    if ($this->loggedInUser) {
      $this->drupalLogout();
    }

    $edit = array(
      'name' => $user->name,
      'pass' => $user->pass_raw
    );
    $this->drupalPost('user', $edit, t('Sign In'));

    // If a "log out" link appears on the page, it is almost certainly because
    // the login was successful.
    $pass = $this->assertLink(t('Log out'), 0, t('User %name successfully logged in.', array('%name' => $user->name)), t('User login'));

    if ($pass) {
      $this->loggedInUser = $user;
    }
  }
}