suggestion for dependency injection in view tests

In one of my views, I am doing a call to the Facebook graph API which
is a bit heavyweight and you also need a valid token. I am looking
into ways to use mocking/dependency injection to avoid having to do
this call during view tests. So let's say i have this view method:

def suggest(request, usrid = None):
current_user = request.facebook.user
facebook_friends = __get_friends(current_user) # heavy call

during testing I want to use something simple:

def suggest(request, usrid = None):
current_user = request.facebook.user
facebook_friends = [(2, 'John Doe'), (4, 'Jane Doe'), (5, 'The
Frog')]

Any suggestion how to do mocking/DI from a view?

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