Npgsql.Tests.CommandTests.StatementMappedOutputParameters C# (CSharp) Method

        public void StatementMappedOutputParameters()
        {
            using (var conn = OpenConnection())
            {
                var command = new NpgsqlCommand("select 3, 4 as param1, 5 as param2, 6;", conn);

                var p = new NpgsqlParameter("param2", NpgsqlDbType.Integer);
                p.Direction = ParameterDirection.Output;
                p.Value = -1;
                command.Parameters.Add(p);

                p = new NpgsqlParameter("param1", NpgsqlDbType.Integer);
                p.Direction = ParameterDirection.Output;
                p.Value = -1;
                command.Parameters.Add(p);

                p = new NpgsqlParameter("p", NpgsqlDbType.Integer);
                p.Direction = ParameterDirection.Output;
                p.Value = -1;
                command.Parameters.Add(p);

                command.ExecuteNonQuery();

                Assert.AreEqual(4, command.Parameters["param1"].Value);
                Assert.AreEqual(5, command.Parameters["param2"].Value);
                //Assert.AreEqual(-1, command.Parameters["p"].Value); //Which is better, not filling this or filling this with an unmapped value?
            }
        }