spy() all guice created instances (in test cases)

I am using Guice for DI in my application. While writing test cases also, I want to use Guice for dependency injection. Now most of the time I want to inject original instances, however in some test cases, I want to spy() out the injector created instances to control instance behaviour.

Is it possible to spy() all instances created by injector so that individual test cases can enforce selective behaviour while maintaining normal behaviour everywhere else ?