Your test fails because a request is made which you haven’t specified.
Try to add:
$httpBackend.when('GET', 'views/core/main/main.html').respond(fakedMainResponse);
Of course you should also define fakedMainResponse.
Please take a look also at the documentation (section Request Expectations vs Backend Definitions) which says:
Request expectations provide a way to make assertions about requests
made by the application and to define responses for those requests.
The test will fail if the expected requests are not made or they are
made in the wrong order.
The second paramete of $httpBackend.when is actually a RegExp. So if you provide a RegExp that will match all other requests it should work.