This module is thought to run tests in development mode in order to speed up TDD. - Put your tests in the DevTestRunner class. - Call gwtSetup() and your test in the entryPoint. - If you need any assertion method provided by the junit library put it in the class MyTestCase. There are already a bunch of them. - Run the module in development mode: mvn gwt:run or lauch it from eclipse - See the output of the tests. If there is a failure a stacktrace should be shown in the output. - Modify your test code and reload the application in your browser. - When your test was ready put it in your test class extending GWTTestCase.