When you navigate to the test history page (http://<jenkins>/job/<jobname>/<buildnumber>/testReport/history) and click on the "History" link in the sidepanel again it tries to open
http://<jenkins>/job/<jobname>/<buildnumber>/testReport/history/history instead of
http://<jenkins>/job/<jobname>/<buildnumber>/testReport/history.

This is the jelly file where the link is being put together:
/core/src/main/resources/hudson/tasks/test/TestObject/sidepanel.jelly

Unfortunately I haven't found an elegant solution to always get the correct URL, right now it's always relative to the current page.

Maybe someone can pick this up, or point me in the right direction (is there a predefined URL variable that points to http://<jenkins>/job/<jobname>/<buildnumber>/testReport/ ?).