public Testlet(string testletId, List <Item> items, ITestletRandomizer testletRandomizer)
{
TestletId = testletId;
Items = items;
this.testletRandomizer = testletRandomizer;
}
public Testlet(string testletId, List <Item> items)
{
TestletId = testletId;
Items = items;
testletRandomizer = new TestletRandomizer(); //indication the design should be reconsidered to use dependency injection.
}