public function testCanUseAuthenticationExtensionsViaPluginBroker()
{
$options = new SmtpOptions(array('connection_class' => 'login'));
$transport = new Smtp($options);
$connection = $transport->plugin($options->getConnectionClass(), array(array('username' => 'matthew', 'password' => 'password', 'host' => 'localhost')));
$this->assertInstanceOf('Zend\\Mail\\Protocol\\Smtp\\Auth\\Login', $connection);
$this->assertEquals('matthew', $connection->getUsername());
$this->assertEquals('password', $connection->getPassword());
}