It would be useful to have Test buttons next to the Remove buttons for the CT Logs tab under System Configuration.
The buttons would work similar to the "Save and test" button for CT Publishers (on the "Publishers" page), e.g. send a "get-sth" HTTP request.
Probably the testLog method in CTCustomPublisher should be broken out to a common class. It needs to be accessible from both the "admin-gui" and the "ct" modules, so a pre-requisite step is to check which module it could go into.
(Ask Samuel if you need an explanation)