Unit test for a problem with queries with @ symbols

RavenDbIssueWithAtSymbol.cs

    class Entity
    {
        public string Id { get; set; }
        public string AuthorId { get; set; }
        public string Title { get; set; }
        public string Language { get; set; }
    }

    class Index : AbstractIndexCreationTask<Entity>
    {
        public Index()
        {
            Map = entities => from entity in entities
                select new
                {
                    entity.AuthorId,
                    entity.Title,
                    entity.Language,
                };
        }
    }

    public class TestsForAt : RavenTestBase
    {
        [Fact]
        public void ShouldAtBeEscaped()
        {
            var store = NewDocumentStore();
            
            new Index().Execute(store);
            using (var session = store.OpenSession())
            {
                session.Store(new Entity
                {
                    AuthorId= "users/42",
                    Title= "@andrew is a fine guy",
                    Language = "en"
                });
                session.SaveChanges();
            }
            using (var session = store.OpenSession())
            {
                var requestedLangs = new[] {"en", "pt"};
                var query = session.Query<Entity, Index>()
                    .Customize(q => q.WaitForNonStaleResults())
                    .Where(e => e.AuthorId == "users/42" &&  e.Title.StartsWith("@") && e.Language.In(requestedLangs));

                Assert.Contains("@andrew is a fine guy",
                    query.ToList().Select(e => e.Title).ToList());
            }
        }

        [Fact]
        public void EscapingAtDoesNotWork()
        {
            var store = NewDocumentStore();
            
            new Index().Execute(store);
            using (var session = store.OpenSession())
            {
                session.Store(new Entity
                {
                    AuthorId= "users/42",
                    Title= "@andrew is a fine guy",
                    Language = "en"
                });
                session.SaveChanges();
            }
            using (var session = store.OpenSession())
            {
                var requestedLangs = new[] {"en", "pt"};
                var query = session.Query<Entity, Index>()
                    .Customize(q => q.WaitForNonStaleResults())
                    .Where(e => e.AuthorId == "users/42" &&  e.Title.StartsWith(@"\@") && e.Language.In(requestedLangs));

                Assert.Contains("@andrew is a fine guy",
                    query.ToList().Select(e => e.Title).ToList());
            }
        }
    }