public void NumNode() { using (var context = new BloggingContext(ConnectionString)) { context.Database.Log = Console.Out.WriteLine; var blog = new Blog { Name = "_" }; context.Blogs.Add(blog); context.SaveChanges(); var nodeCount = context .Blogs .Select(x => NpgsqlTextFunctions.NumNode(NpgsqlTextFunctions.ToTsQuery("(fat & rat) | cat"))) .FirstOrDefault(); Assert.That(nodeCount, Is.EqualTo(5)); } }