The only way I have found to not check code coverage on my JUnit tests is to right click on the package, choose Coverage as..., and then choose configuration. Then I can unclick my test package. I have tried every possible combination to exclude test under the general preferences/java/code coverage/exclude and not seen any changes. I always put my tests in a separate test source folder with the same package name as my src code.
Do I really have to configure every single project to ignore my JUnit tests? This seems redundant. Why would anyone want to check the coverage of their tests?