How to authenticate Supertest requests with Passport /Facebook strategy/?

I'm using Passport.js for authentication (Facebook strategy) and testing with Mocha and Supertest. How can I create a session and make authenticated requests with Supertest for Facebook strategy?

Here is the example test for when user not logged in:

  describe 'when user not logged in', ->

    describe 'POST /api/posts', ->
      it 'respond with 401', (done)->
        request(app).
          post(API.url('posts')).
          set('Accept', 'application/json').
          send(post: data).
          expect('Content-Type', /json/).
          expect(401, done)

Thank you for advice :D