muzich/vendor/swiftmailer/tests/bug/Swift/Bug118Test.php

<?php

require_once 'Swift/Tests/SwiftUnitTestCase.php';

class Swift_Bug118Test extends Swift_Tests_SwiftUnitTestCase
{
    private $_message;

    public function setUp()
    {
        $this->_message = new Swift_Message();
    }

    public function testCallingGenerateIdChangesTheMessageId()
    {
        $currentId = $this->_message->getId();
        $this->_message->generateId();
        $newId = $this->_message->getId();

        $this->assertNotEqual($currentId, $newId);
    }
}