Mock a public property on a static method?

I am using Confide which requires you do something like

Confide::user()->id

To get the user ID. And I am trying to mock this so it returns a garbage user id. I can mock Confide::user() fine by using Laravel's built in Facade mocking

Confide::shouldReceive('user')->once()->andReturn('blah');

If I run Confide::user() it returns blah.

But how can I add a property so if I run Confide::user()->id it returns a mock value?