Horde_Imap_Client_Data_Capability_Imap::query PHP Method

    public function query($capability, $parameter = null)
    {
        if (parent::query($capability, $parameter)) {
            return true;
        }
        switch (Horde_String::upper($capability)) {
            case 'CONDSTORE':
            case 'ENABLE':
                /* RFC 7162 [3.2.3] - QRESYNC implies CONDSTORE and ENABLE. */
                return is_null($parameter) && $this->query('QRESYNC');
            case 'UTF8':
                /* RFC 6855 [3] - UTF8=ONLY implies UTF8=ACCEPT. */
                return Horde_String::upper($parameter) === 'ACCEPT' && $this->query('UTF8', 'ONLY');
        }
        return false;
    }

 public function testImpliedExtensions()
 {
     $c = new Horde_Imap_Client_Data_Capability_Imap();
     $c->add('QRESYNC');
     $this->assertTrue($c->query('QRESYNC'));
     /* QRESYNC implies CONDSTORE and ENABLE. */
     $this->assertTrue($c->query('CONDSTORE'));
     $this->assertTrue($c->query('ENABLE'));
 }