public void ParseApplyWithNestedAggregation()
        {
            string apply = "groupby((UnitPrice), aggregate(Sales($count as Count)))";

            IEnumerable <QueryToken> actual = this.testSubject.ParseApply(apply);

            actual.Should().NotBeNull();
            actual.Should().HaveCount(1);

            List <QueryToken> transformations = actual.ToList();

            // verify groupby
            GroupByToken groupBy = transformations[0] as GroupByToken;

            groupBy.Should().NotBeNull();

            VerifyGroupByTokenProperties(new string[] { "UnitPrice" }, groupBy);

            groupBy.Properties.Should().HaveCount(1);
            groupBy.Child.Should().NotBeNull();

            AggregateToken groupByAggregate = groupBy.Child as AggregateToken;

            groupByAggregate.AggregateExpressions.Should().HaveCount(1);

            EntitySetAggregateToken entitySetAggregate = groupByAggregate.AggregateExpressions.First() as EntitySetAggregateToken;

            entitySetAggregate.Should().NotBeNull();

            entitySetAggregate.EntitySet.ShouldBeEndPathToken("Sales");
            VerifyAggregateExpressionToken("$count", AggregationMethodDefinition.VirtualPropertyCount, "Count", entitySetAggregate.Expressions.First() as AggregateExpressionToken);
        }
        public void ParseApplyWithNestedFunctionAggregation()
        {
            string apply = "groupby((UnitPrice), aggregate(Sales($count as Count,  cast(SalesPrice, Edm.Decimal)  with average as RetailPrice)))";

            IEnumerable <QueryToken> actual = this.testSubject.ParseApply(apply);

            actual.Should().NotBeNull();
            actual.Should().HaveCount(1);

            List <QueryToken> transformations = actual.ToList();

            // verify groupby
            GroupByToken groupBy = transformations[0] as GroupByToken;

            groupBy.Should().NotBeNull();

            VerifyGroupByTokenProperties(new string[] { "UnitPrice" }, groupBy);

            groupBy.Properties.Should().HaveCount(1);
            groupBy.Child.Should().NotBeNull();

            AggregateToken groupByAggregate = groupBy.Child as AggregateToken;

            groupByAggregate.AggregateExpressions.Should().HaveCount(1);

            EntitySetAggregateToken entitySetAggregate = groupByAggregate.AggregateExpressions.First() as EntitySetAggregateToken;

            entitySetAggregate.Should().NotBeNull();

            entitySetAggregate.EntitySet.ShouldBeEndPathToken("Sales");
            entitySetAggregate.Expressions.Should().HaveCount(2);
            VerifyAggregateExpressionToken("$count", AggregationMethodDefinition.VirtualPropertyCount, "Count", entitySetAggregate.Expressions.First() as AggregateExpressionToken);

            AggregateExpressionToken funcAggregate = entitySetAggregate.Expressions.Last() as AggregateExpressionToken;

            funcAggregate.Should().NotBeNull();
            funcAggregate.Alias.ShouldBeEquivalentTo("RetailPrice");
            funcAggregate.Method.Should().Equals(AggregationMethodDefinition.Average);

            FunctionCallToken funcToken = funcAggregate.Expression as FunctionCallToken;

            funcToken.Should().NotBeNull();
            funcToken.Name.ShouldBeEquivalentTo("cast");
        }