I'd like to be able to see an icon in the gutter indicating that a unit test exists for a method, and that clicking on it would take me to that test. Likewise, the same icon next to the test would take me back to the tested method. Like Ctrl-Shift-T ("Go to Test Class/Go to Tested Class") works. Presumably it would look like the current icon but perhaps a different color like green.
Mousing over the current icon shows text like "Create JUnit test for method: "; mousing over the new icon would show text like "Go to test class for method: ]]>" or "Go to tested class".
Hard to do?