Currently, the per-unit-test information is limited to name, status, and time. There used to be a link too, but it appears to have gone away.
For failed tests, there's often more information that can be useful - stacktrace, error messages, sometimes a video/screenshots (Selenium style things).
Besides users liking to see this info without running the test locally, sometimes running the tests is actually hard (Or just time-consuming - it might require 10 minuets build to get the error details).
We should allow storing some kind of artifacts per individual [failed] test.
Retention policy might be hard though, if we allow screenshots/videos.