Structure your JUnit test suites to simplify unit testing — you can easily run all your tests with one command.
In every package directory, create a test suite called AllTests, containing all TestCases in that directory. For example: com.zikzak.widget.util.AllTests (This can be generated automatically by the Eclipse IDE.)
Create a global test suite, e.g. com.zikzak.widget.AllTestsGlobal, and add all new AllTests classes to its suite() method. This way you will be able to run every single JUnit test with a single command, just by running the global test suite.