it('returns 0 when nothing has changed', () => {
   req.session.userId = fixtures.u1.id
   req.params = {
     userId: fixtures.u3.id,
     query: '',
     posts: [{id: p2.id, updated_at: null}, {id: p3.id, updated_at: null}]
   }
   return PostController.checkFreshnessForUser(req, res)
   .then(() => {
     expect(res.body.count).to.equal(0)
   })
 })
 .then(() => PostController.checkFreshnessForUser(req, res))