Last modified: 2013-12-05 17:27:56 UTC
The browser tests are assuming the user Selenium_user exist. It should instead rely on the user passed within the environment variable MEDIAWIKI_USER and its associated password in MEDIAWIKI_PASSWORD.
This issue was resolved with the following commit: https://gerrit.wikimedia.org/r/#/c/99257/
The wmf6 (2013-12-05) cut hasn't been made yet, so this actually goes into the cut for today, not wmf7. :-)