Powermock is a popular mocking framework (https://code.google.com/p/powermock) which can be used to mock classes or methods which otherwise can not be mocked. This project is about to enable its use in OSGI environments especially using it for testing Eclipse Plugins.
Simply add one of the desired features to your target platform using the latest update site.
powermock-osgi> mvn clean install
powermock-osgi/p2> mvn clean install
The latest version is based on 1.5.6 Powermock. Update site: https://raw.githubusercontent.com/liptga/powermock-osgi/master/update-site/1.5.6.0 . See the release notes.
I tested ONLY the Junit+Mockito+Powermock feature. The others should also work, but I did not test them.
Known limitation is that Powermock can play only with classes in exported packages, but it is usually enough. It is possible however to export some packages only for usage of powermock using the x-friends manifest entry. See http://blog.vogella.com/2010/05/25/x-friends-in-equinox/.