In order to get one project weaving into another, you need to place the aspects on the aspect path of the test project. To do this:
- Convert your test project to an AJ project
- Project -> Properties -> AspectJ Build -> Aspect Path
- Add the aspect project
- Full build
This should work. Alternatively, if you can't convert the test project to an AJ project, add the test project to the In path of your aspect project. Then launch the tests from the class files of your aspect project.
More on inpath and aspect path here: http://eclipse.org/aspectj/doc/released/devguide/ajc-ref.html