How to unit test angularjs controller with $location service

Answer 1

Why don't you simply use a spyOn function?

describe('OpponentsCtrl', function() {

    var location;

    beforeEach(module(function($provide) {
        $provide.factory('OpponentsCtrl', function($location){
            location = $location;
        });
    }));

    it('should change location when setting it via show function', inject(function() {    
        spyOn(location, 'path');    
        expect(location.path).toHaveBeenCalledWith('/new/path');
    }));
});

Hope this helps!