I see the testRun icon when I think I should se the testfail or testerr icon.
See the attached screen shot, it's taken after the test run has finished.

First, the main icon (Ant test) is wrong, it shows the running icon, but should show the fail or error icon (don't know the different between fail and error.)
Second, the expanded group had two failed tests in it. The icon for the group should show the fail or error icon, not the running icon.

Other than that, nice plugin!