When analyzing the robustness of the SmokeTest category for JENKINS-49263
I have found that JenkinsDatabaseSecurityRealmTest#login_and_logout is failing sometimes with the following error:

expected:<jenkins-acceptance-tests-user (Full Name)> but was:<null (null)>

I have debugged the problem and the issue seems to be that login is not finished (or at least not shown in the UI)

Things that I have tried so far:

• Dynamic wait of 10 seconds for log in link -> Seems to reduce flakiness but did not solve it
• Refresh the page in case log link is not found to avoid cache problems -> No effect
• The login form is correctly submitted because the test is automatically redirected to home after logging

Not sure if this may be a performance issue, but 10 seconds for a login seems more than adequate for me.

The test has to be fixed and reincorporated into SmokeTest category