private void ConfirmAggregatedRecords(List <RecordBase> recordStream)
{
InternalSheet sheet = InternalSheet.CreateSheet();
sheet.Records.Clear();
((List <RecordBase>)sheet.Records).AddRange(recordStream);
IList sheetRecords = sheet.Records;
DrawingManager2 drawingManager = new DrawingManager2(new EscherDggRecord());
sheet.AggregateDrawingRecords(drawingManager, false);
Assert.AreEqual(4, sheetRecords.Count);
Assert.AreEqual(BOFRecord.sid, ((Record)sheetRecords[0]).Sid);
Assert.AreEqual(EscherAggregate.sid, ((Record)sheetRecords[1]).Sid);
Assert.AreEqual(WindowTwoRecord.sid, ((Record)sheetRecords[2]).Sid);
Assert.AreEqual(EOFRecord.sid, ((Record)sheetRecords[3]).Sid);
}