core_rsslib_testcase::test_redirect failures due to tinyurl

Hello,

running unit tests, core_rsslib_testcase::test_redirect fails aparently because http://download.moodle.org/unittest/rsstest.xml is not a valid document http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fdownload.moodle.org%2Funittest%2Frsstest.xml

When running it i got the following notice:

PHP Notice: A feed could not be found at http://tinyurl.com/lvyslv. A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed. in /var/lib/jenkins/workspace/Moodle-TestsOnly/lib/simplepie/library/SimplePie.php on line 1520

And this is the test failure summary:

1) core_rsslib_testcase::test_redirect
Failed asserting that 'A feed could not be found at http://tinyurl.com/lvyslv. A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed.' is null.

/var/lib/jenkins/workspace/Moodle-TestsOnly/lib/tests/rsslib_test.php:135
/var/lib/jenkins/workspace/Moodle-TestsOnly/lib/phpunit/classes/basic_testcase.php:64

To re-run:
/usr/bin/phpunit core_rsslib_testcase lib/tests/rsslib_test.php

I've tested commit ee788142f200c292a3ad95d8dedf61429e4eb761