ezcMailImapTransport::expunge PHP Method

    public function expunge()
    {
        if ($this->state != self::STATE_SELECTED) {
            throw new ezcMailTransportException("Can not issue EXPUNGE command if a mailbox is not selected.");
        }
        $tag = $this->getNextTag();
        $this->connection->sendData("{$tag} EXPUNGE");
        $response = trim($this->getResponse($tag));
        if ($this->responseType($response) != self::RESPONSE_OK) {
            throw new ezcMailTransportException("EXPUNGE failed: {$response}.");
        }
    }

 public function testExpungeNotSelected()
 {
     $imap = new ezcMailImapTransport(self::$server, self::$port);
     $imap->authenticate(self::$user, self::$password);
     try {
         $imap->expunge();
         $this->fail("Expected exception was not thrown.");
     } catch (ezcMailTransportException $e) {
     }
 }