public void Conditional()
        {
            var test      = SqlExpression.FunctionCall("test");
            var trueExp   = SqlExpression.Constant(45);
            var falseExp  = SqlExpression.FunctionCall("testReturn");
            var condition = SqlExpression.Conditional(test, trueExp, falseExp);

            SerializeAndAssert(condition, (serialized, deserialized) => {
                Assert.AreEqual(SqlExpressionType.Conditional, deserialized.ExpressionType);
                Assert.IsInstanceOf <SqlFunctionCallExpression>(deserialized.TestExpression);
                Assert.IsInstanceOf <SqlConstantExpression>(deserialized.TrueExpression);
                Assert.IsInstanceOf <SqlFunctionCallExpression>(deserialized.FalseExpression);
            });
        }