Create a Run Configuration that will look for tests in the whole project. Make sure that you choose All in package and In whole project in the configurations dialog:
Make sure that you choose the <default> package in the Choose Package dialog.
Now you can select to run this configuration using Run 'All in project' with Coverage:
The result will be presented in a separate coverate window:
And you will also see the result in the Project View window for a fast overview:
