Mocking a SMS sending function in a class view Django

I am writing a Django class view that is supposed to run a few database checks, then create an object and send some information via SMS. The class is as follows:

    class MyClass(GenericAPIView):

      def send_info(content, number):
        send_sms(content, number)

      def post(self, request, *args, **kwargs):
        #... Do a bunch of stuff
        send_info(content, number)
        return Response(status=200, data="Request processed")

Now I would like to test the view, of course I can't check whether and which the SMS is received.

I do have a developement variable in settings.py that make sure for the moment that the info is just printed on screen, but I would like to use the unittest.mock library to write a test that simply checks whether send_info() is called, so that I won't be bother checking what info is passed (which is random).

How would I go about it?