$this->assertCount(1, $crawler->filter('button[id=config_save]'));
$this->assertCount(1, $crawler->filter('button[id=change_passwd_save]'));
$this->assertCount(1, $crawler->filter('button[id=update_user_save]'));
$this->assertCount(1, $crawler->filter('button[id=config_save]'));
$this->assertCount(1, $crawler->filter('button[id=change_passwd_save]'));
$this->assertCount(1, $crawler->filter('button[id=update_user_save]'));