When it comes across circular-dependency

Refer to Circular Dependency in constructors and Dependency Injection

I have to quote this:

To find out which one it is, list all of the methods in your class B used by class A, and all the methods in your class B used by class A. The shorter of the two lists is your hidden Class C.

Share mocks between Protractor and Karma unit-test

TL;DR

Just follow this post:
Using Browserify To Enhance Your AngularJS Tests
And change all module in your test code to angular.mock.module, then it's good to go