PermissionDispatcher | based library for generating runtime permissions

I'm designing a system with some not-so-simple classes that require a Context object in order to initialize them. These classes make use of third party classes which also require context initialization. This class also utilizes the context to load a number of string resources necessary to the functionality.

The problem comes with writing Instrumented Unit tests for these classes. When I attempt to get a Context object for the test using InstrumentationRegistry.getContext(), I run into an exception where the context cannot find the string resources associated with the class (android.content.res.Resources$NotFoundException).

My question is this: How can I design these tests so that the context can retrieve the string resources that I need, and also act as suitable context objects for the third party classes? There's only so much mocking I can do as some of these classes handle auth tokens, which would be difficult to mock. I can't be the only person who's run into this issue in the Android domain, so I'm sure there's a common solution for this presumably common problem.

EDIT: As suggested, I've tried integrating Robolectric (version 3.3.2) in my Project, however when I try and run my unit tests I'm met with the following error: