private Testlet CreateTestlet(TestletQuestionSet questionSet)
{
// for a given set of four pretest and eight operational questions
// begin the testlet with a random two of the four pretest and then
// the remaining eight ordered randomly.
// ensure that incoming questionSet has four pretest itmes and six operational items
if ((questionSet.PretestQuestions.Count() != 4) || (questionSet.OperationalQuestions.Count() != 6))
{
throw new IncorrectNumberOfItemsException("A testlet needs to include exactly four Pretest and six Operational questions");
}
var newTestlet = new Testlet();
// randomize pretestItems
var randomizedPretestItems = questionSet.PretestQuestions.OrderBy(i => Guid.NewGuid()).ToList();
newTestlet.Questions.AddRange(randomizedPretestItems.Take(2));
var randomizedRemainingRange =
randomizedPretestItems.Skip(2).Concat(questionSet.OperationalQuestions).OrderBy(i => Guid.NewGuid()).ToList();
newTestlet.Questions.AddRange(randomizedRemainingRange);
return(newTestlet);
}
public Testlet AssembleTestlet(TestletQuestionSet questionSet)
{
return(CreateTestlet(questionSet));
}
