What is the Protractor way to test what is shown before Angular loads

I believe that it's a good practice to inform users that an Angular-based application is loading. I mean, in case of Angular 2, it's e.g. <view>Loading...</view>. I am sure that there is a way to do the same in AngularJS (v1) as well. Thus I believe that there should be a way to use Protractor to test such aspect of the application since it is "an end-to-end test framework for AngularJS applications".

It was suggested to me that there is a way to do that and that I should ask here. So, can you please help me to find the approach which had Nick on his mind? It does no necessarily has to be compatible with Angular 2 already. AngularJS (v1) approach would be enough since I believe that it will be ported once they port Protractor.

This question seems to be similar to Protractor: test loading state but unlike OP I want to make sure that the Angular application is not loaded before the test finishes so I guess that there should be a way to suspend/stop loading of the application (but I may be wrong).