You can change a test and re-run it without having to re-run the entire suite . To do so you have to enable the Keep JUnit running after a test run when debugging checkbox on the Launch Configuration page and to run in Debug mode. Your VM has to support hot code replace for this feature.
You can set the JUnit view as a fast view and have it show the results only where there are failures or errors. Select the Window > Preferences > Java > JUnit > Show the JUnit results view only when an error or failure occurs checkbox.