Guiced EE has been built to allow unit and integration testing at any level, without any impact to existing module-info files,
It allows you to modify the boot sequence dynamically to include or exclude any modules of your choice

All* of these should be called before GuiceContext.inject()

You can modify the Classpath Scanner configuration for instance by accessing the configuration
All loading modules are made available through the GuiceContext.instance() accessor.
By using the load methods, you can alter the execution sequence in any way.
Lets say you want to add a path exclusion in your test to see what happens when the file isn't present
                () -> {
                    Set output = new HashSet<>();
                    return output;

You can manage what modules get loaded, in your tests to swap them out say, for their test counterpart,
Each Guiced EE Module gives you tools to manage unit testing them, for instance servlets, persistence, and web sockets.
GuiceContext.instance().loadIGuiceModules().add(new TestJTADBPrivateModule());