public void ShouldReturnPositiveRatings()
{
var db = setupDb();
var user = db.Users.Single(u => u.Login == "user1");
var service = new RecommendationService(db);
var actual = service.GetPositivelyRated(user);
Assert.Collection(actual,
r1 => Assert.Equal(0, r1.Id)
);
db.Database.EnsureDeleted();
}