public void To_String()
        {
            _sqlGroupingSelectExpression.AddAggregationExpressionWithName(_aggregateExpression2);
            var result = _sqlGroupingSelectExpression.ToString();

            Assert.That(result, Is.EqualTo("GROUPING (KEY: \"key\", ELEMENT: \"element\", AGGREGATIONS: (\"agg1\", \"agg2\" AS a1))"));
        }