How to test a meteor method that relies on Meteor.user()

I am trying to determine the best way to test my code and am running into complications from every direction I've tried.

The basic code is this (though far more complex due to several layers of "triggers" that actually implement this):

1. Client populates an object
2. Client calls a meteor method and passes the object
3. Meteor method uses Meteor.user() to get the current user, adds a "createdby" attribute to the object, inserts the object and then creates another object (of a different type) with various attributes that depend on the first object, as well as a bunch of other things already in the database

I'm trying to use Velocity and Jasmine. I'd prefer to integration test these steps to create the first object and then test that the second object is properly created.

My problem is that if I do it on the server, the Meteor.user() call doesn't work. If I do it on the client, I need to subscribe to a large number of collections in order for the logic to work, which seems kludgy.

Is there a better approach? Is there a way to simulate or mock a user login in a server integration test?